What are overall dimensions and can I raise the wheel up and down on the shaft for larger glass pieces? Can your grinder smoother spears fit this machine. I have more questions but I'll wait to here from you first.Thanks

Maxi-Lap dimensions are 12-1/2 x 24 inches. The wheel head does not move up and down, but there is a spacer that can be added to move the wheel head up beyond the rim of the splash guard. The thread is 1/2-20 on the shaft so cones and domes can be directly screwed onto the shaft by removing the wheel head.