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FYI - New Craftsman easily replaced old unit.
Chain and sprocket of new unit were same as old unit - as I had hoped. Contrary to what Sears Service people told me. Bolt patterns even the same. So didn't have to change out track and chain and all the bracket hardware. Pushbuttons and photo-cells OK as is. Pretty much plug and play. Old remotes don't work with new 'rolling code' system.
Now have large box of spare parts.
Took me about 4 hrs to change out operator unit, but could easily do it in an hr next time.
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