BSI 24 B window channel

Hello there!

Sure, we'd be happy to help with this. I will just need more information so that I can identify exactly what you have. Can you remove your balance from the window and show us photos of the top and bottom fittings? The video below will go into more detail. 

Thank you for the photos! Based on what I see here, my recommendation is the Series 380 or Series 385. You'll need to measure as shown below to determine the best match. The 24B stamp on the metal channel may translate to our 2420 option but you could always weigh the window sash on a scale to confirm it falls within the 9 to 15 pound weight range. 

Comparison of the S378, S380 and S385 balance shoes.