when to go to double rollers?

A quick learner from New Hampshire says:
Do you know if usually sliding windows, about 2 feet across by 53 inches high, would take two wheels?
This one is in, but I can barely open the window.
Thanks, Kathy
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Dave Sr. from SWISCO responded:
It's hard to say. There are a lot of factors that go into it. Could you show me a picture of the window? Can you also show me a picture of the roller in question? That would be a huge help.
A quick learner from NH says:
A quick learner from NH says:
my glass only just got replaced,along with ONE roller, so now when I open it sideways it seesaws and tips. Acorn is out of business, windows in 1980 28 x 56 x 5/8 thick. I would bet installed should have ordered a right and a left side?
A quick learner from NH says:
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Paul from SWISCO responded:
Thanks for getting back to us. The housing on the 87-141 Acorn roller is designed for one wheel that can be adjusted to the different slots, which in turns raises and lowers the sash. That may be the problem your window sash is having if it's dragging. In my experience, this is usually due to the 87-141 wheel being in the wrong slot. Check that out and see if it fixes your issue.
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