Non tilt balance

Quick Learner from Utah
Hi, need to replace this 28 inch long, approx 0.55 inch wide non tilt window channel with marking 2740 BSII. Winged fittings in both ends, though broken.
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Bob
Bob from SWISCO
SWISCO
Expert

Greetings. This looks like an S380-28 or S385-28 Channel Balance. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below for reference. Compare both with your old balance to see what matches best. In either case, for the stamp option choose 2740.

Comparison of the S378, S380 and S385 balance shoes.
Comparison of the S378, S380 and S385 balance shoes.

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