looking for replacement balances

Quick Learner from welches, or
Looks like the rope has frayed and will need to be replaced.The window latch itself says "Mercer" and the only other markings say "18-5 FES CMC 75" channel is 20"
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Bob
Bob from SWISCO
SWISCO
Expert

Hello there. I'm sure we can help, but I need to confirm a few details before proceeding. First, can you double-check the length? Be sure to measure only the metal channel--do not include the end fittings or attachments in this measurement. I believe it should be 19". 

Second, do the nylon fittings or attachments at either end have 'side tabs', or what we call wings? It's admittedly a bit hard to tell from your photos. See the diagrams below for a reference about what I mean. If they do indeed have these wings, then you need either the S380-19 or S385-19. The only difference between these two channel balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. Compare the second diagram below with your old hardware to see which balance Series matches best. In either case, for a stamp option choose 1850. Let me know if you have further questions or concerns.

Close up view of the S380 balance top.
Close up view of the S380 balance top.
Comparison of the S378, S380 and S385 balance shoes.
Comparison of the S378, S380 and S385 balance shoes.

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