Replacement channel balance?

Question

Hi! I'm so glad I found your site.

My windows are hard to move now (non tilt, one sash), after about 20 yrs. It seems the springs are pulling against me and need replacing. Does that sound right?

Here are pics of the part I think needs replacing. It's 1/2" deep.

The number 3040 is stamped on one end, which I think you can make out in the picture.

Thanks!

Kirk

Bob · Accepted Answer

Hey Kirk. You are correct that it sounds like you need to replace some of these channel balances. And yes, many of these do indeed look alike at first! The balance in your photos appears to be either an S351-31 or S390-31. The only difference between these two balances is the depth of the bottom nylon shoe, or the heel-to-toe measurement, so compare both with your old hardware to see what matches best. You'll need a stamp option of 3040.