Thank you for reaching out to us! I'm confident we can help with this but we'll need a bit more information. Can you show us a closer photo of the knife lock shoe? We will also need you to weigh each window sash and tell us the weight for each one. The stamps for your balances differ from our rating system so the weights will allow us to determine the proper strength options.
Thank you kindly for waiting while we looked into this. The metal channel lengths for your balances are very odd and I'm afraid we can only supply balances that measure in full-inch increments. We recommend you contact Weathershield directly to see what they suggest in regard to replacements. I am very sorry for the inconvenience.
