Leave the roller alone. Loosen then 3 bolts of bracket on door. Lift the door higher than the center line and tighten the bolts and retest. That is the proper way to adjust the height. If the door is too high or too low, repeat. Before the next procedure, mark the present bracket location and adjust according wioth the markings as guide.
If you can send pictures, that would be the best.
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Sunday, September 9th, 2012 AT 11:36 AM