Tom from SWISCO responded:
July 28, 2017
Hey there! Thanks for contacting us. Stamps ending in 9, like your "28 9," use an old rating system that has since fallen out of use. One of the more modern stamp options for the S351-28 will probably work, but you will need to weigh your sash on a scale to confirm.
Channel balances like the S351-28 should work for a good 5-10 years, depending on how often the window is used. There are no "better" made balances. They are pretty much all manufactured the same way. |