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I think the best alternative would be to have a ready supply of usable factory diaphragms, but then I'm a hopeless romantic.

Maybe the factory authorized shops have access to better components than JBL sells to consumers. If not, you could be without tweeters for a very long time while the shop waits on usable parts.

Expense aside, the new production JBL 'phragms appear to be unusable. So you can stick a blown Porche engine in your Porche and keep it in the garage, or stick a Focus engine in it and drive it.

For $30, you might just buy a couple more and see if you can get a pair to match up fairly close. The new production JBL units seem to be stuggling with QC.