How to reattach the "head" of a ground wire?
A crimp on eyelet or forked spade connector should do. There's nothing particular about a turntable ground wire like there might be for an antenna wire. I'd probably cut off the damaged end, re-strip with the appropriate size tool, and crimp to fresh wire. A locking pliers (Vice-Grip) works will in a pinch. So to speak.



It's also possible that the wire never had a connector. Some grounding lugs are designed to take a bare wire. Simply wrap the wire once around the lug, under any washer that's present, and snug it down lightly.