Quaker balances

Thanks for writing in. It appears you either have the S351-24 or S390-24, as well as either the S351-25 or S390-25. The only difference between the Series 351 or Series 390 Channel Balances is the depth of the bottom nylon shoe, or the measurement from 'heel-to-toe'. See the diagram below for reference. Compare both options with your old hardware to see what matches best.

Comparison of the S351 and S390 balance shoes.

For the S351-24 or S390-24, choose 2350 for a stamp option. For the S351-25 or S390-25, go with 2450. Let me know if you have further questions. 

Hello. So long as the shoe is deeper than 1", I would go with the Series 390. Most likely it just wore down a bit due to age, hence why it's not quite measuring to 1-1/8". You could always check another balance just to be safe, but I think this is most likely the case. Let me know if you have further questions!