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MW 3500 series double hung windows. Balance for top and bottom

A quick learner from USA says:
The top looks like 26.5" series 850 crossbow balance. The bottom looks like 28" series 795 channel balance. Enclosed is photo's of both parts in and out of window

Thanks Walt
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. Are these two balances from the same window? One window really should only use one type. I agree that the Series 850 and Series 795 look like what you have pictured, though.
A quick learner from cottageville south carolina says:
Yes I had built this house new and all the windows are the same. Low e glass. But this is what are in all the windows. Channel on bottom and the top is different. I remember in 2004 the windows were M.W.
Profile picture of Tom
Tom from SWISCO responded:
That is not common practice. I don't know why the original installers used two different kinds of balances in the same windows. All I can say is that the two balances I picked out appear to match what you show.
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