Nice to have helpful mates!
More information please - Where are you located? Which mirror - primary or secondary? Nothing left but glass? What did your "mate" do? Maybe the mirror surface isn't any good now? (If primary, have you checked the secondary as well?)
No choice now - you'd better tell the whole story and show us a photo!
From what I read, recoating is available. Buying a new mirror might be a better approach? Looks like around A$400 gets one a new 10" f5 mirror in Australia.