At a minimum, I need to replace one tilt lock, or one complete balance assembly. I have several windows with the same mechanisms, and would like sufficient information to order more parts, and possiby also plastic extrusions as the need arises.
The detailed diagram of your part is actually known as a balance knife lock shoe, our 15-014. These are used with our Series 751 balance. I see that the stamping on your balance has a "28" on there. May we have the metal length measurement of your balance?
Thank you! I would bet our 29" long balance will work for you. That would make sense with your stamp of "28," except your stamp is also missing the letters meant to go after it. I know, I know, it does have the letters "Kd" but I don't think these are that important. I'd wager that's just a manufacturing stamp.
I would look at our S751-29 channel balance. I think this is what you need. However you will need to weigh your sash on a scale to confirm the best option. You can see a chart on the S751-29 store page that tells you how much weight each balance can support.