I'm having problems with my epi les paul standard feeding back, and i think it might be the grounding wire. i read that there is one that is attatched to the bridge, but i cant find where it is. i know on a strat, it is in the tremelo cavity, but where is it on a les paul?
I believe it's threaded through a tiny hole and it's touching the underside of the bridge.
If you need to check if one is there, I think you would need to unscrew the stoptail.

Or, you could route a tiny hole and put in a new one, and perhaps affix it well. I know the stock one is just trusted to rest against the bridge screw.

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