Hi Tim, I'd be interested in the grinding attachment. I have a pm160 I got used. I think mine is from the 70s. Mine had a 5hp 3 phase I swapped a 5hp single in. The cheap VFD I was using popped. I need to readjust everything this weekend, I'm getting a little snipe and the boar is slightly canting when it comes in. So many little adjustments to dial these in. let me know about the grinding stuff. I'm going to research if the 180 fits the 160. Thanks Patrick