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Replacing a trolley rack on a screw drive garage door opener.

I want to get instructions on how to replace a trolley rack part no. 81C168.

My garage door manual model 139.5399211 doesn't reflect that. Are there videos or parts replacement instructions somewhere online. Please help, thanks.

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Garage Door Openers , Garage Organization & Shelving
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Manage My Life
I know how important it is to have the proper instructions when repairing the trolley rack for your garage door. I was able to find a couple links that include helpful information for this repair. I attached the links below. I hope this helps.
by Manage My Life
May 13th, 2012
Answered in 1 hours
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