Rob,
Any chance of some photos of the damage??
I notice your scope is mounted on a tripod/GEM. Do you want to keep using this mount or, for ease of use, do you have any thoughts about a dob. I am suggesting this as your scope probably has a thin wall steel tube that would probably be difficult to replace with formatube or aluminuum and still use the same tube rings. OTOH you could use the existing optics and build a new dobsonian scope around them.
Another alternative is to visit your local automotive panel beater for advice on repairing the existing tube.
Cheer,
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