Over the last couple weeks I've been experimenting with potential ways to apply a sealant of some sort to the inside of the Jinhao 10 (and presumably 20) around the part with the trap door (not the door itself).
I designed and 3D printed these, based on the nib unit, to poke/prod at the inside in various ways. So far nothing has worked to get coverage in the correct place, though.
At least now I have a variety of ways to open the trap door and inspect things, I guess?
#FountainPens


