M-mount rear cap for Jupiter-12?

yossarian123

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Pretty much as the title says - I've got a J-12 w/the extra-deep screwmount rear cap. Except I only shoot with a LTM M-mount adapter, so putting the lens back in my bag means I have to unscrew the adapter then screw in the rear cap. Pretty clunky, especially if I'm walking around outside. Is there a better solution - is there an M-mount rear cap that's deep enough to cover the J-12's protruding butt?
 
Just cut a 35mm canister (plastic) and its a perfect fit....if you leave the cap on the other end its as good as a screw on rear cap.
 
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