2640 chanel balance

With this combination of attachments, you could have either a S380 or S385 channel balance. You need to measure your bottom attachment as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You should be good to go with a 2640 spring strength option once you determine which balance you need.

Thank you and let us know if you have any other questions or concerns.

Comparison of 15-004 and 15-005