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Damage is done, not much choice here. Do not get desperate though. First, buy a WD40 spray and spray it generously into the thread from inside and outside. The bolt is bent on outside, right? That is good news. Means a lot of thread may still be intact. After WD40 soaks in for 5 minutes or so - use the force to unscrew the bolt in proper direction. It should get loose. If you would not be able to screw it off and out of the thread check what holds it in. May be some clip. After that you will need to find a suitable replacement and try to screw it in. If the tread damaged more than I expect - tapping a new thread will be an option. Can be done at home - but better at some mechanical workshop.
Yes, and telescope must be off and away from the mount.
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