I was so excited the other night when I bought my new r4512. It was heavy and a lot of work getting it home and built. I was disappointing to find after building it the blade would shift 1/16"-1/8th" right when I turned the blade height knob up and would shift to the right when lowering the blade. The shift was at the back of the blade which if it shifted toward the fence could cause kickback. So I took it back to Home Depot and they helped me open up another r4512. It had the same issue as did the display model. I give HD credit for being understanding and helpful, but I'm very disappointed the the Ridgid quality control.