Block & tackle channel guide for non-tilt window

A home owner from Washington state says:
1/2 inch
Vinyl window
24 4 BN CALDWELL is stamped on the side
User submitted photos of a window balance.
Profile picture of Mike
Mike from SWISCO responded:
Based on the measurements of your balance shoe will determine whether you will go with our Series 380 or Series 385 channel balance. Please get back to us and let us know how you make out.
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