Thanks Mark and Jeff - I want to replace the secondary due to damage. When I do so, I don't want to get one that is too small, or too large. I've also adjusted the primary as per the recommendations the Russian users had on these first versions.
The travel is insufficient to get focus on modern eyepieces without the 28mm primary mirror adjustment.
As for its quality, they are exceptional. I love mine, and I certainly want to have a proper matching secondary. Does anyone know the strehl quality on the primary on these? I know it probably won't make a difference too much - but I'm emotionally attached to the thing!
>but there are other options too.
What do you mean Jeff? Tell me more.