I have a couple 8-in. 2118H midranges from a Cabaret 4612B. One sounds buzzy, the other has a damaged dust dome, sounds sort of telephony, but otherwise not buzzy. I'm thinking I could swap the diaphragm from the damaged dust dome one into the buzzy one and maybe get at least one good speaker out of it. But I have never tired this before. I need a COMPLETE guide to changing diaphragms. Can't seem to find it with Search. Any tips? What test equip I need, etc.. Thanks