2730 AD B.S.I. channel balance replacement

Question

I need help identifying the replacement channel balance.  The stamp on my channel says 2730 AD B.S.I.  The shoe has a depth of 1-1/16(worn down from 1-1/8?), and doesn't have wings.  The metal channel measures 28".  The sash weighs 16.5 pounds.  Thanks!

Casey · Accepted Answer

Hello,

It looks like you have either our S351-28, with a 15-002 bottom attachment, or S390-28, with a 15-001 bottom attachment. If the shoe is definitely measuring over 1", the S390-28 would be the way to go.

Take a look at the image below to determine which balance you'll need. You'll also need a 2730 spring strength option for your replacement balances. Thank you!

Comparison of the S351 and S390 balance shoes.