Replacement Milgard Window Channel Balance

Thanks for posting! It appears you need a new non-tilt channel balance. I am confident we can help; I just need to know a bit more information. Let's start with the bottom nylon fitting, or the shoe. Please take a look at our 15-004 and 15-005 channel balance shoes, and note their depths. The depth is the 'heel-to-toe' measurement, as illustrated by the picture below. As you can see, the shoes are 1-3/32" deep and 1" deep, respectively. Which one more closely matches your own bottom attachment? Let me know, and we'll proceed from there.

Comparison of 15-004 and 15-005

Thank you. In that case, I believe you have our Series 385 Channel Balance, which uses the 15-004 1-3/32" deep shoe. You'll next need to determine the length of the metal channel, not including the nylon fittings at either end. You've indicated already that this measures 21"; if so, then you'll need the S385-21. 

You'll then need to choose a stamp option, which designates the strength of the balance. If your old balance was stamped 20 5, this suggests you should choose a stamp option of 2050, which indicates a balance that will support a window sash in the weight range of 23 through 27 pounds. However, I noted that you claimed the sash weighed 15 pounds; is that accurate? Did you ever have trouble closing the window or keeping it closed prior to the old balances failing? If not, and if you're uncertain about the weight, in general we recommend replacing the original stamp exactly whenever possible. Let me know if you have further questions.