[Awalker]

I have a neighbor selling a Star 50 pound trip hammer for $1200. The only problem I see is that the belt pulley, for the wide flat belt drive has a chunk about 1" deep and 3" long taken out of the side. Are these pulleys avaiable to buy or will I needto repair it? Also, how do you convert a wide (3 or 4 inch) belt drive to an electric motor?
Thanks