'69 Barracuda T56 swap, floor, cross member

goldduster318 said

I understood it as you were tightening the bolt itself against something or using a slide hammer. I wasn't thinking you were holding the bolt still and tightening a nut on the bolt threads. Using that method I'm a lot more suprised if it twisted off flush. I would usually use at least a grade 5 but I have a lot of grade 8 stuff since tractor supply always sold them by weight and not by the piece.

Click to expand...

It was a long threaded screw which I screwed into dowel pin, used a deep socket, and a nut spun up the threads that rested on the socket. Then I held screw from turning and turned the nut up against the deep socket. The long screw snapped off right at the dowel pin. This long screw I had laying around in an old peanut butter jar with a bunch of other screws. So not sure what grade it was. Apparently low grade. So I would think grade 5 or 8 would have prevented it or at least reduced the chance of bolt snapping.

I drilled and tapped and used a long screw with nut up against socket etc based on research I did on the web. It is a very common technique and everyone says its full proof always works. Didn't work for me though cause screw snapped from the pulling force.