channel balance

A home owner from Lodi CA 95242 says:
October 13, 2022
block & tackle channel balance marked "27 4 NM" and "BSI" or "BSL" across the top.

this balance is near impossible to move along the slide. I need to replace it. would I have a choice of channel balances that would allow less force to be used opening (pulling up) the lower sash?
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Tom from SWISCO responded:
October 18, 2022

Thanks for your photos. Based on what I see here, you have either our S380-28 or S385-28, depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
28" Series 380 Channel Balance
28" Series 380 Channel Balance
S380-28
$10.97
28" Series 385 Channel Balance
28" Series 385 Channel Balance
S385-28
$10.97
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