Tilt out window pulley system replacement

A handy person from Marion,NC says:
Older dual slide window sashes
25" channels with the # 24 stamped
Looks like 5/8" wide channels
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Bob from SWISCO responded:

Looks like you have an S751-25; look over the specifications to be certain. To know what stamp option to choose, weigh the window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option on the balance's shop page. 

How to install a ribbed tilt channel balance with knife lock shoe
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