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I'm having the same issue with my garage door opener. I replaced the carriage/trolley a couple of years ago with the same problem. I just took the carriage off and the metal teeth are very worn down. I guess these don't last very long. I found one on Ebay for $19.25, shipping included.
I think mine is wearing down so fast because the whole mechanism vibrates horribly when it runs, and always has since I bought this house 4 yrs ago. Any idea what might be causing this? I can't believe this garage door opener has lasted this long, I've been expecting it to keel over 4 yrs ago.
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