sash weight for these channel balances

Question

Hi! I'm unsure of how to figure out which channel balances I need for a sash weighing 33 lbs. The old ones are stamped with 2640 and something that looks like an upside down U.... I'll add photos so you can see! Otherwise, I think I have the right one - S385 Thank you for your help!

Casey · Accepted Answer

Hello,

This could be either our S385-27 or S380-27 with a 2640 spring strength option depending on how your dimensions compare to the diagram below. Thank you!

Comparison of the S378, S380 and S385 balance shoes.