My 15 yr. old + Craftsman 1/2 HP unit, chain drive, quit working today
(luckily after my wife left for work). I opened the cover to find the drive
gears stripped. A trip to Sears with the model #, dimensions, etc.
convinced me that a whole new unit, with the newer safety features (electric
eyes, auto reverse ...) as well as more lighting was worth the $ and effort.
I left Sears at 11:30 am, dismantled the old unit, ate a quick lunch, and
dove in. By 3:15 pm I had the new one working, including running the wires
to the eyes and switching out the main control pad. I'll leave the outside
remote unit for spring - its 15 F and snowing here. Not a bad days