I have an edger model 536-737542 that uses the same Sears belt, part number 32668, which should be a suitable replacement, but when I installed this it was at least 1/2 inch shorter. When the edger blade is in its highest position, the belt must have enough slack to disengage the belt from the blade drive pulley to keep the blade from rotating. On this belt, it was too tight and maintained contact with the blade drive pulley, causing the blade to keep turning. I could only lower the blade to…