I got an AT115EDT straight from Astronomics in early Sept., but terrible weather and the semester starting up means I haven't gotten to use it much - once for first light with M31, and then again last night. I didn't use the camera rotator on M31, but did last night when working on the Horsehead and I noticed this cracked white plastic/spacer O ring:
It doesn't look like this affects rotator operation, but I don't want moisture getting in here. I'm also guessing this does nothing good for collimation, particularly as the standard flattener just slots into the 2" eyepiece adapter. Does anyone know a part number for this ring or where to order a replacement? It looks like a fairly standard Stellarvue part that's rebranded by a few different companies.