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Wayne & Paul, I have to agree with you mostly. If you are using the
correctly machined screw from Celestron, the threaded section is only 3/8"
long. After that section passes completely through the rear cell it enters
an open space just a little longer than 3/8" with the mirror full back. It
is then free to enter the threaded hole in the aluminum mirror support
without interference. No problem. However, if you substitute a fully
threaded bolt then the bolt can only enter the mirror support if the support
position is spaced from the cell by focus knob to an integer x .05" (20TPI)
unless the structure bends. I don't know if they attempt to tap both holes
simultaneously or not. With my mirror full back I cannot run a standard 1" x
1/4-20 bolt through both pieces unless I nudge the mirror forward ~ 1/2 turn
of the focus knob. Perhaps yours line up in phase by chance or mine is out
of phase by defect?
I've only had my mirror out once a while ago and I recall copious orange
"adhesive" around the back side of the mounting hole. You're right,
"cement" doesn't really describe it correctly. Most of this structure is
well documented in a series of photos in the files section for anyone that
doesn't want to disassemble to get a look or is contemplating disassembly.
Hope my comments were not too misleading - welcome the corrections. Ed