Quote: Thats a lot of weight hanging on a single 1/2" fine thread bolt with no safety support of some kind under it?
not even 1/2". Seat belts use 7/16" fine threads. A safer method would be pass a chain or cable through a body plug hole and into a thick piece of steel underneath. I don't think stressing the seat belt anchor is a great idea since you may need that seat belt to be strong in the event of a crash.
