So my Bora has been a right bastard in regards to it's wishbones/ball joints. What a saga. Mechanic has had to cut the bolts off, which is fine and all. However, weirdly, when putting in the old bolt for the drop link to connect to the wishbone, it tightened but then didn't tighten fully. It will continue to turn tightly and that's it. He checked for play, there is none, and he even hit it several times to see if it would come out, which it hasn't. It spins tightly with a ratchet but refuses to move by hand or force. He suspects the very end of the bolt has been damaged slightly.
Question is, will it be safe? He certainly seems to think so. There was no play whatsoever.
Sounds like the threads may have stretched, probably just due to age and rust. I doubt it's dangerous but may clonk about when the weight of the car and some cornering force is applied.
I'd be inclined to replace the bolt, but still use the car in the mean time.