Tom from SWISCO responded:
July 1, 2015
Have you seen our 87-165? This looks like it could be a match.
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Paul from SWISCO responded:
July 2, 2015
The manufacturer only supplies one wheel because each slot in the housing is at a different height, which works to adjust the sash. They don't feel the extra wheel is necessary. At this time we cannot supply those extra loose wheels for this housing. As for the button guide, look at our 87-032 and see if it would work for you.
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