Lawson sh7500 number 3520 on metal

With this combination of attachments, you could have either an S380-36 or S385-36 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You'll also need 3520 spring strength options for your replacement balances.

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Comparison of the S378, S380 and S385 balance shoes.