I've got a grounding/shielding question. Can anybody help me out? I have a MIA Fender 1975 RI Jazz bass. Reissue means all the best of old-school design and all the worst. For some reason, my Jazz buzzes constantly, until I touch the control plate. Then it's dead quiet. Isn't there something that can be done about this? I can solder, shield, etc.--as necessary. I just need to know what to do. As you'll see from the pics below, the cavity is not shielded. Should I do that? Alternatively, I noticed that there is only one white wire attached to the input jack. Is that correct?