Hey there - I have my beloved 2008 American Standard Precision bass. I took it to my local shop to have "Fender Original Precision Bass" (1962 reissue) pickups installed. The tone is awesome - of course! However, when my fingers touch the poles while playing, I get an ugly "BZZZZZ." They installed the ground plate under the pups. My pickguard has no tape on the back of it. And, the electronics cavity is bare. Would (a) adding shield tape to the pickguard help and (b) shielding the cavity help? Is this something I can do as an electronics simpleton? I have changed pickups on other basses, installed a dozen bridges and changed tuners.