Thanks Hupp36, but I messed around with it enough and figured it out (broke one of them in the process though). I'm going to try to reproduce one.
For anyone else that may stumble upon this looking for how to do this, the straps are held in by metal wedges from the bottom of the casting on the axle assembly. If you rap on the bottom side of it (where the green arrow is pointing in the pic below) several times alternating on both sides of the wedge, it will fall right out. Don't hit it where the red arrow is, thats where I broke the piece.