Can I switch Series 860 balances for the series 850?

A quick learner from Cranston, RI says:
Good Day,
I have vinyl windows in my house that have swisco 860 style balances and am having trouble replacing them. Can I substitute the 860 balance for the 850 balance system which seems much easier to replace?
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Paul from SWISCO responded:
I think it could be possible, yes. To convert from the Series 860 to our Series 850, you would need to also switch out your pivot bar. The Series 850 uses our 26-318. Check to see if you could install this pivot bar on your sash.
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