Stick a GSO mirror in it, if your going to keep it. Bintel sell them. Of course it's pretty cheap to just buy a GSO 200mm imaging newt from Andrews, if you really want that apeture.
Honestly, a scope with that list of problems probably is best given away to a youngster to play with, or put out in the Council cleanup/recycle. Trying to resurrect it is just going to be frustrating and involve more money.
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