Picked up this grinder for free from a house getting demoed. Having trouble figuring out which model it is. found a similar one on vintagemachinery.org : SB132 (116 frame) but that one is 1/3 hp. Mine is 1/2 118 frame. anybody have any idea? worth keeping or selling? It does turn on and works well, bearings sound a little noisy- assuming they are dry and should be a oil port somewhere.