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Hello Teken, Thank you so much for your suggestions, I really appreciate your time so much like you wouldn't believe. I do not have a Jackshaft styled unit, what I have is a trolley styled unit with belt drive. Meaning I do not have that motor unit which mounts beside the garage door and...

Hello, I have the exact same problem as you described. My opener is a Sears Craftsman Model 139.18405D, I hear they are re-branded Chamberlain Liftmaster units. I've read the liftmaster manuals online as an alternative and it uses the exact same fonts and exact same pictures in their...