I recently found this old belt grinder at an electrical surplus shop just sitting on the ground. I bought the thing and brought it home but cannot find any information on this thing. The guy told me at the store he thought it was a 2"x72" belt grinder but I measured the loop around all the wheels and only measured 60"-63" after you let out all the adjustment. Also the two wheels towards the back are both 1-3/4" wide wheels however the bottom wheel in the front where the platten connects is only 1-1/2" is that normal?? The only information on the cast aluminum frame states, "Sandmaster Products