MI Window Coil Balance Spring

I see you have a Coil Balance Shoe, 15-180 and a Coil Balance Clip, 15-186. These are usually used with the Series 190 Coil balance. Look for a number printed on the metal coil that indicates the number of pounds it can carry. If you can't find that, you'll want to weigh your sash and divide that weight by the number of coils that support it. Each coil will carry that number of pounds. For example; if you have a 10 pound sash and two coil balances supporting it, each coil balance will be 5 lb.