Removing a star post or plastic, the nut on top keeps turning but will not come off. Under the playfield there is no T-nut to hold, only the round head of a carriage bolt fitted from below.
Post nut just spins on a carriage bolt: hold the post and break the nut free
Cause: The nut is seized on the bolt threads, so the whole carriage bolt turns in its hole. Quicksilver uses carriage bolts from below at many post locations instead of the usual threaded posts.
Checks
- See whether the nut turns on the bolt or the nut and bolt turn together.
- Check how much bolt sticks up above the nut and how much room there is under the plastic.
Fix
- Clamp locking pliers on the post or bolt above the playfield to keep it from turning, and turn the nut with a wrench.
- Once the nut moves up, grip under it with small locking pliers and work it off the rest of the way.
- If it still will not move, two nuts locked together on the top threads can be used to hold the bolt; as a last resort cut the bolt and fit a new carriage bolt or a T-nut and threaded post.
Systems
Games
Source: Pinball Repair help group!! (Facebook group)