Hello,
I have several defective window balances, of various sizes. They all single hung, non-tilt, sideloading block & tackle style. The particular one in the photos has a stamp reading U B 28B
Thank you
Paul from SWISCO responded:
February 27, 2015
This looks like our Series 380 channel balance. Check it out and let me know if you agree! I would recommend our S380-28 with a stamp 2820 option.