Checking your heart function with the 'Ricoh pin'.
Does anyone know how to fix that damned pin?
A minute drop of superglue or just push it in with brute force using a fork prong. Both work but the pin will never work again (just a warning incase you need it to for some reason).
BTW, the war reference made me smile.

Brute force got my first one off as well ... only had the camera a few days.
. My Flickr
CHEERS Vic.
Born again biker with lots of Pentax bits. Every day I wake up is a good day. I'm so old I don't even buy green bananas.

Both the *istDS and the K5 are incurably addicted to old glass
My page on Photocrowd - link
I assume that it is an M42 mount, jamming in a PK adapter. Those 'Ricoh' pins are a ruddy nuisance. Sometimes they don't give trouble in a genuine Pentax M42/PK adapter but often jam in other brands. There was quite a long discussion just over a year ago in this group.
link
Lots of comments, including a note from me describing my earlier problems with a Pentax 28mm M42 and some adapters.
Martin
A few of my photographs in flickr.
Lizars 1910 "Challenge" quarter-plate camera; and some more recent stuff.
Sdeve
Member