Propshaft stud

Rear prop end that goes in handbrake drum, 1 of the 4 studs that are from the handbrake drum will not tighten as stud is turning with the nylock, not sure how to resolve and looking for help? Any suggestions kindly received

New stud

You can get a new set quite cheaply, remember the handbrake drum bolts are longer than the bolts at the other end.

Bolt will be knackered and rounded on the inside of drum. They're held down by a circlip to a peice of metal on the flange that stops turning unless the head is rounded or clip has popped off but then it will push back too. Take off drum and circlip replace bolts. Kits only a few quid on fleabay can get whole output shaft kit.
Might need some oil too. Or put rear end on ramps incline should give enough to save changing oil.