Apologies, there are two types of A500 connections from membrane to controller, all the ones I have seen are the same as A1200, except at a right angle. The other type is split into two, I don't know what kind of connector it has.
Anyway, these connections are delicate. I get the feeling this type of connector is designed for one time assembly then maybe one or two reinsertions for service over a products lifetime. After this, even handled properly the contact can break the conductor on the membrane. I've used Akiras trick a few times successfully though I don't scrape any green plastic off or cut as much off. I just trim maybe 1mm off the end and that moves the contact point up beyond the part that has broken into a fresh area. Silver paint too.
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