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The flat fronted plate with a bevelled rear face is correctly mounted into
the open end of the focuser. The front face has a male thread that the eyepiece holder screws onto, which appears to have been done, but from the pic I can't see if it is screwed hard up against the flat face. The eyepiece holder is indeed about 35-40mm long, and is intended to be in that position.
It can't have an f/4 mirror installed because the focal point would be radically different, so nothing would come to focus. Perhaps a member
with knowledge of these scopes who lives near you could come to your place to check it out.
raymo
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