[david3921]

Originally Posted by Ski_rush

I'm new to working on bikes...I am not really sure what you're talking about. Either on top or bottom of the fork, I don't see any hex shape. I really don't understand how the right side tightened right up, but the left side is just spinning. It doesn't make sense to me because looking at the hex bolt, it appears to thread right into the bottom of the fork, and initially goes on fine, but then just spins the end? What is it threading into if not the bottom of the fork tube?

And assuming the shape is a hex, how would I know what size bolt head or nut to weld to this rod?

The bolt threads into the fork's piston. Think of a tube within a tube. There should be a nut or a square or hex shaped hole so that a tool can be used to keep the piston from spinning. I'm guessing that it's a hole of some shape since humanbeing and rail are both suggesting a tool that fits into something.