Adjusting Infinity on a Jupiter-9 (M42)

[derevaun]

My J-9 just doesn't know quite when to stop--it's a tiny bit past infinity. It looks to me like it's an easy fix, but I'm a bit jumpy after reading so much about badly reassembled lenses. Anybody done this and care to spell it out? Thanks in advance!

 

[Sonnar Brian]

If this is an M42 lens used on an SLR, I would not worry about it.