I went out this last Sunday and did a little observing with my PST. I bought the little scope second hand almost a year ago. Of course there is not a lot of surface activity going on these days but there was a little flare on the limb.
I was having a little trouble getting the image focused so I decided to take the side cover off to check the prism. Yep, it is tilted slightly. I twisted it a little beyond the correct angle and blocked it with some tissue for a few hours to see if it would correct without having to remove and re-glue (I've read here that others have had luck pushing it back into position without re-gluing).
While apart, I took a look at the TIF but couldn't really tell if it was starting to rust or not so I separated the eyepiece holder to get at the retaining ring. I made a little metal tool, removed the retaining ring and tilted the scope so the filter would drop out. It hasn't started to rust (yet?), I even held it up to a bright light and looked through it and it looks clear out to the edges.
Now my problem, I'm not sure which way it needs to go back in. How do I know which side faces the prism? Or does it really even matter. Looking at the filter, both sides seem reflective. There is a ring around the filter that laps over on one side. Attached are pics of both sides, can someone help please.