So I found a two sided rectangular oilstone - half green and half black
IIRC I bought it to sharpen chisels - I put a line of sharpie pen on fret 12 of the stingray
I used the thin, long side of the oilstone to flatten fret 12 on the stingray just enough to remove the sharpie ink - the bass plays better in that zone
trying Andy’s ski jump removal step on the P bass (using wide side of the oil stone) will have to wait until the weekend