My garage door trolley broke so I had to look for a replacement. The upper half with the guide rails actually came loose and no longer held the door handle on the worm gear. I contacted local garage door suppliers, we overpriced this part ($45-$50) and I know it didn't cost that much. I found this item at Revain for $8 so I bought two just in case. I received the item the next day and although it is the same cart and setup as the original, the material is slightly different. It's softer and not as hard. I'm not sure if this will make a difference in the long run as to how long it lasts, but for now it fixed the problem and the garage door is working again. Installation took only 5 minutes, so replacement is not difficult.
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