Paul from SWISCO responded:
October 13, 2015
Thanks for posting, Rich. You might have something like our 84-137 corner roller. To replace it, first turn the top two adjusting screws counter clockwise to lower the wheel. Then, remove the screen wire at the upper part of the door and lightly tap out the rail. Now you should be able to remove the corner wheels to see if our 84-137 is a match.
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