Wrong parts

Based on your photos, the S140-21 that you ordered appears to be our best match. That should have worked. Can you go into more detail as to precisely why it didn't?

Gotcha, thanks for clarifying. Since the major difference is a matter of size, we'll need the exact size of the old hardware. If possible, please remove one of the original balance assemblies from the window and show me a clear picture of it by itself. Seeing it side-by-side with the S140-21 that you purchased would also help. Please also tell me its precise width and thickness.

We can start there and see if we can find something that will fit in the window track more smoothly.

Ah, okay. I understand the problem now. I thought the balance in your first batch of photos was the original. Your original balance is actually an entirely different style, so that would explain why you ran into issues.

I recommend looking at our 15-199 pivot shoe, as well as either the 3/8" thick Series 165 or 1/2" thick Series 160. We also sell the 15-205 cover for 3/8" springs 15-150T cover for 1/2" springs. You will need to measure the thickness of your old springs to confirm what size you need.

Sure, that looks like a tilt latch. See our 26-243 and 26-244, I think these may be just what you're looking for.

Tell us the exact weight of the window sash. Give us that exact weight, and we can work out what you need. 

Thanks! So, that's a bit of a weird weight. If you're using the 3/8" thick spring, then the sash weight should be an even number. You may want to double check.

The rule of thumb is to basically divide the sash weight by how many springs are used to support it; in your case, 6. What we're doing here, for instance, is dividing 21 by 6, which gives us 3.5. 

Our S160-3 gives 3.5 pounds of support per spring, which would be perfect for you if it weren't for the fact that it was 1/2" thick instead of 3/8". That's obviously no good. If we're working with the Series 165, then the next best thing would be to use two 4 pound springs and one 3 pound spring on each side. That gives you 11 pounds of support per side, or 22 pounds total. Does that make sense?

If you want to go that route, then use two S165-4 and one S165-3 balances per side.