28F is stamped on channel

Question

Need help with this part. Part is stamped with 28F. Heart is 29 inches long. width is 9/16  trade it considered as half inch.

Emily · Accepted Answer

Hello there!

Thank you for reaching out to us. It appears your hardware is a match for our S380-29 or S385-29 channel balance, depending on the depth of the bottom shoe. Measure as shown in the image below to see which one matches up best. Based on your 28F stamp, you may need the 2860 spring strength option for a sash weighing 32 to 35 pounds. You can always weigh your sash on a scale to confirm.

Comparison of the S378, S380 and S385 balance shoes.