Window balances for Mastic windows

Thanks for posting, Jackie. I'm not sure what to recommend as Mastic used many different style of balances. Other than size, are all the balances identical? If so, show me a few pictures and I will try my best to replace them. If you can, please also give me your measurements for the balances themselves, not the window.

In the meantime, see our Series 600 spiral balance. Mastic has been known to use this, but I cannot confirm if it's what you have.

Assuming you have spiral balances, you would measure the tube. Specifically, you need to measure the diameter and its length. We would also need to know the weight of the sash and whether the window i s tilt or non-tilt. The only thing we could tell based on the sash size is the length and strength, and even then it wouldn't be completely accurate.

See the videos below, they should help clarify what information we need. This is of course just assuming you have spiral balances. Based on your information I think that's what you have, but you would need to confirm.