Schmidt & bender pm11

[superdry]

I’ve got an S&B pm11 second focal plane that I’m about to put up for sale, I’ve got a replacement rubber eyepiece for the one that’s on it (the existing one has a tiny nick in the rubber) trouble is I can’t get the ring off and I don’t know if it’s left or right hand thread. Has anyone replaced theirs?
Thanks in advance

 

[Jagdmatch]

The rubber rings that adjust the magnification are stretched over, do not try unscrewing anything, the rubber is glued into two channels around the eyepiece. . If the focus adjustment will not move then it may have an issue. The replacement is tricky but achievable

 

[superdry]

The rubber rings that adjust the magnification are stretched over, do not try unscrewing anything, the rubber is glued into two channels around the eyepiece. . If the focus adjustment will not move then it may have an issue. The replacement is tricky but achievable

No mate I don’t mean the magnification rubber I mean the rubber outer edge of the eyepiece I’ve got replacements but I can’t unscrew it and I can’t tell if it’s left or right hand thread.

 

[DVS1]

I'd be inclined to think the ocular bell rubber ring is also glued into a channel but I don't know for sure

 

[scotch_egg]

Put a photo up for clarity. But if it’s a rubber O ring I’m pretty sure you don’t want to be unscrewing the eye piece. It may allow the nitrogen to escape and condensation to enter.

 

[Jagdmatch]

The rubber bit will pull off but the factory glue is good. You will need to scrape out any debris before putting the new one in

 

[Woodlander]

With my PM11 12-50, I sent it back to Schmidt as I think it’s moulded on and can only be done properly at the factory.
Speak to Schmidt and confirm with them first, before trying anything yourself