Couldn't get the blower motor to spin all day (no heat)...not even with assistance. Just for the heck of it I put the OLD chewed up belt back on and what do ya know...the motor spins and the furnace is working. The guy over at advance gave me an undersized belt. Just found out that motors under 1 hp should have a somewhat loose fitting belt. About a 1 inch depression is about the right amount of tension on a fracional motor.