Hmmm. I'm just trying (not too hard) to push the cap down on my bullet pen, and it reaches a pint where it just doesn't go any further. I wonder if something was missing on yours Zepla? Maybe an insert inside the cap or something?
I have my 2nd Fisher Bullet at the moment, (having lost the one I've carried since the age of about 12) and I've never had any problems at all with them. No ink bogies either!
Anyone that wants rid - feel free to send them to me
I think they're great!