I got a cool Fern Green Esterbrook J (with 1 cap) and really like the thing.
The body of the pen has a crack around the cap-threads, but it's only apparent when removing the section and bladder.
Which I did. because I wanted to see it. but that's not the issue.
The issue is the constant seepage of ink around the feed/section interface.
Again, I took the feed and nib out, but this time for a good reason! It was 0.1mm off-center and bugging me.
So now it leaks, it gets into the cap, it spreads onto the section and gets on my fingers.
How to fix it?