Tag Archives: fountain pen restoration

How Do I Restore a Conklin Crescent

We are by no means done with the Decameron 2020 Project. However, I felt like getting back to pens for a posting. If you’ve been mostly coming for the storytelling, who knows, maybe you’ll get a kick out of a deeper dive into old fountain pens.

Here is a Conklin Crescent 2NL fountain pen in need of restoration.

Let’s look at one of the oldest “self-filling” fountain pen filling systems. In the earliest days of fillable fountain pens, any pen with a bladder or ink sac was considered self-filling. Before that you had dips and eyedroppers. Conklin invented the crescent filler in 1898. For as cumbersome as it looks, it was an insanely simple design. The pen is hollow like an eyedropper, but there is a rubber ink sac affixed to the nipple of the section. A crescent is fitted to a flat steel bar, and when the safety ring is rotated into the proper position, the crescent can be depressed, flattening the rubber ink sac within. The rubber ink sac wants to re-inflate, which fills the sac with ink and pushes the crescent back out of the barrel. Way less messy than an eyedropper, it was an instant hit. Even the famed American author Mark Twain was hired to be an advertising spokesman for the pen.

Don’t soak a Conklin hard rubber pen for very long, as it will discolor the old hard rubber. Be sure to get the water over the end of the section and on to the barrel threads.

If you already read our “How Do I Re-Sac a Vintage Pen” article, this isn’t very different. However, most of these pens are made from black hard rubber more than 100 years ago, and they are very brittle. You want to make sure you are pretty comfortable with restoring plastic/celluloid pens first. These early Conklins are getting much older and harder to find, and they break much more easily.

As with before, you will need some ink sacs, a pair of spark-plug/section pliers, a long dental pick, sac shellac or rubber cement, scissors that can cut through rubber ink sacs, a jar or cup, clean water, polish, a cloth rag, paper towels, a hairdryer, a razor blade and an ultra-sonic cleaner.

  1. Always start by soaking the nib in room temperature water over the threads of the barrel. Now the trick with old hard rubber is that water discolors it quickly. A shiny black will quickly turn to a chocolate brown haze. Don’t soak it for long, just enough to start to leech out old ink and maybe lubricate the friction fit of the section into the barrel. I certainly wouldn’t soak it for more than an hour. I’d probably soak it for much shorter a time.
  2. Next, remove the nib and section from the water and dry them off.
  3. Warm them up just a little with the hair dryer or heat gun. You only want them to be warm to the touch. Heat will also discolor the hard rubber. Plus, it can melt it.
  4. Scrape the dead ink sac out of the barrel. Be sure to be especially careful shaving the ink sac remains off the section nipple.

    Using your section pliers, gently grip and twist the section counter clockwise in an unscrewing motion. Sometimes it takes nerves of steel, patience and experience to discern the difference between the old ink sac inside the pen cracking and the barrel of the pen cracking. If the barrel cracks, you’ve likely killed the pen and made it nothing more than a parts donor.

  5. Once you get the section to start coming out, gentle, small wiggles can work it out without further stressing it from twisting. Very small wiggles. You can easily break the barrel, especially when the section looks as if it is almost out of the barrel. The more the section wiggles, the more it can act as a lever to crack the barrel. Some people choose the give the nib and section a sonic cleaning and others don’t. The sonic action can destroy the part if there is a crack already starting in it. More than 30 seconds to a minute will start discoloring the rubber. However, I’ve also found that pens this old often are filled with sediment-based inks that need something special like a sonic cleaning to remove the caked-in old ink.
  6. After the section is out, the rest is fairly easy. Scrape out all of the old ink sac from inside the barrel and very gently shave off the remaining sac on the nipple. Your razor can easily cut the nipple or cave in a wall of the nipple. Go super slow and easy with only small motions.
  7. Polishing old hard rubber is difficult. You can wear away a lot of rubber very quickly, ruining imprints and chasing.

    With everything cleaned out and disassembled, that is when I like to polish the pen and parts. You cannot go as rough on century-old hard rubber as you can plastics. I like to use MAAS metal polish on a soft terry cloth rag. Mostly I just give a light going over of the pen and cap with the polish and rag because both strip away the top layers of the rubber and can remove chasing and other imprints. It also removes some of the chocolate hazing. Using a Q-tip, I also polish the nib and crescent.

  8. Reinstall the crescent filler and lock it in place with the safety ring.
  9. Dust the ink sac in talcum power to help preserve it.

    Size and trim an ink sac that isn’t too snug inside the barrel. If you don’t have the crescent filler with the bar reinstalled first, you won’t get the proper fit.

  10. Use orange shellac to attach the sac to the section nipple.
  11. Dust the sac in pure talcum powder
  12. Very gently and slowly reinstall the sac and section into the barrel. This is another high-risk move that can crack the barrel so take it easy. You might even want to warm-up the barrel a bit.

Wait 24 hours for the shellac to dry before filling the pen. Then you are ready to write.

The finished pen should look much cleaner and be ready to write.

Make Your Own ‘J’ Pressure Bars

See how the needle nose pliers have started making a box in the end of the brass flashing as I restored this Sheaffer 5-30.

See how the needle nose pliers have started making a box in the end of the brass flashing as I restored this Sheaffer 5-30.

When I first learned the art of fountain pen restoration, there weren’t as many readily available modern replacement “J” pressure bars to fix most standard lever-filling vintage pens. You could try to scavenge J-bars, but they were so old and brittle, they were prone to breaking.

Fortunately, the man who taught me the art of pen repair was a master of improvising repair work. He taught me a lot about do-it-yourself repairs and engineering. As our goal was fully restored pens that worked as good as new, instead of featuring only all original parts, we had a lot of leeway.

Probably the best and cheapest trick he taught me was to fashion a J-bar out of brass flashing that sells for about a dollar a foot at your local hardware store.

Insert the new pressure bar J first, and make certain the length of the new spring is resting on the lever. Pulling out the new J-bar can risk damaging the lever-filler assembly, so try never to pull the new J-bar if possible.

Insert the new pressure bar J first, and make certain the length of the new spring is resting on the lever. Pulling out the new J-bar can risk damaging the lever-filler assembly, so try never to pull the new J-bar if possible.

I suppose you could use steel flashing, but brass has the advantage of not rusting. Either way, be sure to select a very thin piece that has a lot of flexibility. You will also need scissors that can cut it and a pair of needle nose pliers. Once you get everything together at your work bench, follow these steps.

1. Cut the flashing to be the same length as the barrel of the pen you are restoring.

2. Trim the edge of the flashing along its length to get it to fit in the pen barrel. Remember, keep it wide enough to be engaged by the pen’s lever. Some levers don’t push straight down. Some slip to either side. Make sure you cut the flashing so it is wide enough to accomodate this deviation.

3. Test the flashing by inserting it–still straight/unbent–into the barrel to see if it fits well and gives the lever enough space to manuver.

4. Slip the flashing back out of the barrel.

5. Using your needle nose pliers bend one end of the flashing into an arc. You will only want to bend the last 1/4 inch to 1/2. I like to bend the flashing into 2 90-degree angles. This makes a boxy J. It is perfectly fine to make an arched J.

6.  Test to make sure the J is just wide enough to slide into the barrel, while also providing enough resistance against the barrel walls to anchor it.

7. MOST IMPORTANT: Before final installation, remember to line up the J-bar J first into the barrel with the outside portion of the pressure bar against the lever.

8. Insert the new pressure bar assembly into the pen with your needle nose pliers. Push it all the way into the tail. Be careful not to push the pliers deeper than they are meant to go into the pen. They can easily split or shatter the barrel.

9. Insert the resac’d section, and make sure it all fits okay. If it doesn’t you can either trim down the sac or pull out the new J-bar with care and trim it to make room. *** It is important to note that many lever fillers have a pin or pin-ring that holds the lever in place. Pulling out the new J-bar can snap or ruin that thin piece of metal holding in the lever, and that is a lot harder to fix.

It is always best to make sure you got all of your cuts measured correctly the first time.

Your new J-bar will likely never be as effective as the old one, but it will fill your pen reasonably well. Plus it will also have saved you plenty in parts and labor. Believe it or not, you’ll feel a lot closer to your pen once you’ve restored its guts on your own.