Did you guys try a rubber cement. I used to use it years ago to glue the spider and surround to speaker frames during re-coning of speakers. It would bond rubber and fabric to steel or aluminum and would hold up for years with all the motion a speaker cone goes through. You used to be able to buy it at Crappy Tire, but this was years ago and if I remember it was made by Lepage's. Sorry to get off-topic here.
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