I have recently purchased a set of Dimarzio model j, jazz bass pickups, and wonder if shielding is necessary??? First off, let me say that I have searched the posts for shielding and have found a great amount of conflicting information... I plan on installing these pickups with a traditional j bass vol+vol+tone control plate and pots... I have seen the schematics and have a hard time understanding the grounding deal... If the bridge is grounded, do you still need the shielding??? I have read Hyscock's book on electrickery, but have a difficult time assimilating his excellent info for bass... HELP!!!