SWC Coil Balance Replacement?
This looks like an older version of the S140-10 Coil Balance System to me. Take a look and see if it matches up.
Sounds good! And yes, the S140-10 just has one coil; but so long as its meant to support the same amount of weight, the number of coils doesn't matter. Let me know if you have any other questions, and thanks a lot for your business.
I have the same problem and will be removing the frames, replacing the balances, then re-installing the frames.
Some manufacturers do use a window jamb with a removable cutout, but unfortunately many don't, which means cutting one yourself is the only way to replace the coil balances. Keep in mind that many window companies aren't particularly interested in making it easy to replace individual components; why allow that, when they know some people will just resign themselves to buying whole new windows? Fortunately in this case, the cutout method does let you replace the coil balances themselves. I agree it's not ideal but so long as it's made to one side it shouldn't affect window function.
