30-4 broken balance

Question

I have a broken balance that I'd like to replace. It's 1/2" wide and 31" long. It has "30-4 AP5 CMC 43" printed on the metal in blue ink.

I think it's the Series 351. The bottom shoe looks like it's 1 1/8" deep.

Bob · Accepted Answer

Thanks for posting. If the shoe is 1-1/8" deep, then you'll actually want the S390-31. The Series 351 has a shoe that is 1" in depth. See the image below for reference. In any event, for a stamp option for your new balance, choose 3040. Let me know if you have any other questions.

Comparison of the S351 and S390 balance shoes.