Shear Pins

If you are not sure drill or melt them out. Align the holes and squeeze JB weld quick set in the holes. Years ago we would drill out the plastic on the outer. Slide the inner until its aligned and then drill straight through. Install a piece of lead solder and smash the ends over. Today we just use JB weld. Just needs to be something soft so the shaft doesn't impair your chest in an accident