Whats goin on erebudy, ive been playing drums for 4 years, bass for for about 6 months solid, really listening to bassists for about 3 years, and now I'm ready to start working on my bass. Ill be posting here alot haha, as I'm completely stripping apart my fender p "deluxe special" Which is active, and upgrading the fudge out of it. Im ordering a Mike pope preamp and some emgs to recreate vic wooten's sound and putting it in all by myself, and trying to take advantage of the powdercoating dept in the sheet metal factory I work in. So far I've done the knobs and the input jack plate, and I'd like to do the bridge as well but I found this when I took it off.

does this serve as a ground? If so would it stop me from being able to coat it? , Whats all that white powder, and also whats this stray hole with more powder in it
And what about the tuners? Do they need complete contact with the strings as well?