window balance 795
Hi there!
Thanks for reaching out to us. You need to weigh the window sash on a scale to determine the correct stamp option. There's a chart under the S795-21 product description that indicates the best stamp based on the sash weight. The Series 795 is designed to use a screw for installation. If your balance uses a hook, please let us know.
Note that the closed cam 15-195 shoe comes with the balance by default. I can't tell if your old cam is open or closed, so you'll want to make sure.
If the cam is open, see the 15-195B, which is sold separately.
You can use the 21D stamp option, which is rated for a sash weighing 18 to 22 pounds. The video below will also show you how the T-lock shoe pops on and off.