I would have gone a little longer on the shaft, but the maintenance manager wanted to save some of the steel for his own purposes as well. But... In the scrap metal bin at work I found some other pieces that previously belonged to the same motor/unit. There was a steel collar that the 4" shaft fits right into and also a very large and heavy pulley about a 18" in diameter and a foot in height. The pulley in itself must weigh a good 150 pounds. The shaft, collar, and pulley all have matching bolt holes because it was all part of the same unit. I could bolt the whole thing together and I'd have an anvil that weighed probably a good 230lbs. I just haven't managed to get the pulley home yet. Did not want to damage my car trying to get it home. So either I could take the pulley home and I would have a really heavy anvil, (but it might be a few inches short to my knuckles) or I could just take the shaft and mount it into a bucket of concrete. My other option was to bolt the shaft and the collar to a large stump, but I don't know what the best route would be to take. Is 80lbs plus the weight of a large stump sufficient for forging on, or should I try to take the pulley home?