I picked up an old craftsman 113, the blade wouldn't raise or lower so I tore it down to see what was up and found the cast aluminum braket had broken. Upon further tear down and inspection it looks like the gear teeth on the braket that engage the teeth on the arbor assembly were seized causing the problem but looking at it further it appears the part never was meant to spin. I took the teeth off the arbor assembly and the height adjustment works, do a anyone know how the assembly is meant to work? It appears to me if the teeth are engaged the blade will never raise or lower since both sides are stationary?