Adjustment for the 23-026

A home owner from Mississauga, Ontario says:
How do you make the adjustment to 23-026 item. My one closet door needs adjustment from the bottom up. It is flush with the frame at the top of the door. I can't figure out how this item works. Thanks.
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Tom from SWISCO responded:

The 23-026 is only adjustable in the sense that the guides can slide up and down along the housing in an effort to align the door with the track. They are not meant to hold the weight of the door, however, nor to raise or lower it. That function is relegated to the top rollers/guides alone.

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