I have a bass that was built for me some years ago, which has an EMG-35TW active pickup and one of their bass/treble EQ systems. For a few reasons I'm swapping out the EMG for a passive Basslines SSB-4, and have built a preamp design that I think will sound very nice. I'd like to be able to activate or bypass the preamp to use the bass either in active or passive mode. However, since the bass was built as a fully-active system with no passive mode, there is no ground wire to the bridge, and no hole drilled for that. I'm not very skilled with woodworking and don't particularly want to tackle drilling the hole. Are there any other clever things I can do to to quiet the noise I get with this pickup when I switch the preamp out? I currently have the SSB wired straight to the jack and it is indeed noisy. Or is my only option to drill the hole and ground the bridge, or get someone to do this for me?