I figured it out.....remove the seat and lift the carpet...bit of a pain in the A**..but it will expose the slot that the captive bolt slides into. Pretty easy once the carpet is lifted. I think I am going to just cut the carpet under the metal support the seat leg rests on, the piece the bolt goes through, and thereby exposing the sliding bolt and just slide a new one in. Simple....and the cut won't even be visible.