Sperber mill without the powerhead on. What I needed a part for. I guess the main difference between this mill and others, is that it has the wooden rollers that run against the side of the log and hold the bar at an angle to the log as it passes through, not simply parallel to it. Must be about 30 degrees. Cutting a bit askew I think speeds it up a bit, a not uncommon approach when cutting with the grain with some types of woodwork machinery. It also has aluminum rollers on top, which some people like and some apparently don't. The helper handle allows a single powerhead, or can be removed to have two engines attached. It also has a crank that raises and lowers the rollers to adjust the thickness of the slabs, a nice feature, but I have it disassembled for repair. I added the rubber covered push rail. Sperber Tool Works went on to do other things, and no longer produces mills.