HORRIBLE Feedback problem

I have always done it myself, call them up and see what they charge for potting pickups. But do what heroics suggests first, just in case it is your settings.
 
Farview is right on with the potting thing - don't be afraid to do it yourself.

My only comment is if the coils of teh Invader have tape around them, remove the tape (carefully) before putting the pickup in the wax.

Potting the pickup will solve your problem.
 
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