I have a Buyers spreader and wanted to take the electric motor off to service it. The terminals broke off as I was lossening the bolts for the positive and negative termnals. So now it HAS to come off. I took off 4 bolts that hold the motor on and cannot get the motor loose from the auger. I looked to see if there was a cotter pin or something through the shaft but there was nothing. I imagine that it is a keyed shaft that is probably rusted bad. I have been spraying the shaft with penitrating lube for 2 days now and still cannot get it loose. I think I might try heat next . Any suggestions?