Question: I picked up an older (but not in bad shape) D60, and I'm looking at the D60 rebuild kit available from Kurt. My D60 uses a collar to retain the screw, but the D60 kit ships with a spring retainer. Also, the D60 kit ships with 3 thrust washers, and I only see two on the vise. Is the 3rd one supposed to go between the casting and the front retaining collar? Sadly, the D60 is the ONLY vise kurt doesn't have the exploded diagram on their website! Any insight would be appreciated!