Late model FED-2 and Jupiter-12 mounting woes

[Carey M]

I have a FED-2 that has a serial number starting with 67, so I guess a very late model, from 1967? I also have a Jupiter-12, a black one from 1990.

When I try and mount the Jupiter on the FED, the rear element just comes in contact with a lever/part/thing of some kind inside the. This prevents mounting the Jupiter all the way in, unless I want to scrape the paint off from the rear element. The lens clears the rangefinder cam just fine, so it's not that.

Any idea what this lever/thing is for? Looking at pictures of other FED-2s online, I see similar parts, but these do not portrude the way it does on mine. Anything I can do about this?

 

[farlymac]

That is the back-stop for the rangefinder following cam.

PF

 

[02Pilot]

You can probably just tweak the stop up a tiny bit, or, failing that, take it out and file off enough to allow the rear element to clear.

 

[Carey M]

Alright, thanks guys! I wasn't sure what I was looking at.