Jim Pingle

Father, geek, serial hobbyist.

Comparing the cross-compatible Pilot CON-40, Majohn A1, and Jinhao 10 converters extended and retracted.

The Jinhao has the shortest travel distance, around 13mm. Majohn is about 17mm. Both confirmed with a micrometer. CON-40 is about 16mm, but couldn’t measure directly.

Explains why the J10/20 converters run out of ink faster, but doesn’t explain why CON-40 never seems to fill as much as either of the other two. The agitator parts interfering, perhaps?

Photos of three fountain pen converters next to each other with their pistons retracted all next to a ruler. Top is a Pilot CON-40, the piston appears to be at about the 32mm mark on the ruler. Next is a Majohn A1, the piston appears to be at about the 28mm mark Last is a Jinhao 10, the piston appears to be at about the 25mm mark
Photos of three fountain pen converters next to each other with their pistons extended, all next to a ruler. Top is a Pilot CON-40, the piston appears to be at about the 16mm mark on the ruler Next is a Majohn A1, the piston appears to be at about the 11mm mark Last is a Jinhao 10, the piston appears to be at about the 12mm mark

The Majohn converter ends up with a higher capacity and has an added bonus of being able to see a little bit of the ink level when it is in the Jinhao 20. I’ve replaced most of my CON-40 and Jinhao converters with these Majohn converters.

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