rickenbacker pickup problem (microphonics)

[antieatingactivist]

A friend of mine just got a 650S Sierra. He wanted single-coil pickups in it, as opposed to the humbuckers that come in it. We ordered some High-gains and put them in Using the original gold covers. Somewhere along the line I must have done something wrong because the guitar has tons of microphonic feedback. My 660 has some (which I would like to get rid of if possible), but this is completely un-controlable. Could the Pick-up covers be slightly different? (the actual pickup doesn't seem as tight as it should be in there). Is wax potting an option on the hi-gains (his) or the toasters (mine)? I have never had this problem with any other Rick, so I'm assuming I caused it. Thanks!!

[David Schwab]

My first thought is it's the covers. If they or the pickups are able to vibrate, you will get feedback. You could wax pot them if they aren't already.