Purchased a Power hacksaw. However, UPS ended up breaking the Crank Lever which I now have to rebuild. My question is the variety of people who run this with either a 6" pulley or 7" pulley. I'm trying to make this as original as possible but I can't get a proper picture to mathematically proportion the pulley size. I was wondering if someone knows the original pulley size of this power hacksaw? The drive pulley is still sold at Sears, 560-166 but they don't provide any dimensions and appear over-priced. Thanks for any response.