Channel balance problem

I bought a home and it had one window that was missing a channel balance I thought would be a minor repair. I matched up the remaining channel balance with the Swisco balance and ordered two new ones.

I installed them as your video shows and all did not go well. I was barely able to get the lift out window back in but once it went in I closed the window and as I pushed down I could hear the springs on those new balance's not the normal sound you normally hear when closing a window. I then tried to open the window it was difficult and it would only go up 3/4 the way making the same loud noise. Then when I pushed it down the window again was hard to push sown and when it did go it would not close normally.

No sooner did it reach it's resting place one of the balances sprung and chipped a piece of my window frame . I fought to get the window back and discovered that one of the balances was damaged with a broken pulley or wheel on the bottom.



I did everything right my measurements, the length the end pieces, the installation. Whats wrong?? I think I have the wrong size balance what I have is a S385-27 OPTION 2640 PS I also now have some damaged plastic parts on each side of my window that are attached to the window. Help!

I did measure the metal only and took stamp option number off the only remaining balance it was a 2640. I guess I can weigh the actual window and see what it weighs. I am suspicious of the only remaining balance as it could have also been wrong the people who owned the house before me did a number of questionable repairs to the house that I have had to correct. What do you recommend I do I am more than willing to purchase another pair of balances and will have to replace the plastic parts that are mounted on the window which I assume is to hold the top balance in place. What option do you recommend and is there another way to determin what size balance I need if the one I have are wrong.

I weighed the window with a bathroom scale and got 24 lbs. The height of the window frame is 28 1/2" the height of the actual glass is 25" inches . the old balance says 26 4 LN Caldwell hope that helps.

They are now, if you are referring to the plastic part that is screwed into the window frame at the top on both sides they are now both damaged. I assume that they hold the top part of the balance in place after the window has been installed and pushed down in the closed position.

I have one more question there are two holes on each side where the bottom part of the balance can be placed I was not sure which one to use so I tried the one that appeared to have some ware on it and that seem to work briefly then the top part of the balance pooped out. I tried the other hole and that was when it broke so obviously that one was the wrong one. Do you sell the top parts or guides for that balance and if so give the info and I will replace everything and try again thank you.

I made a mistake in measurements for the channel guides. Here's what I have 1 1/16 from top to the first screw hole center. 1 5/8 to the second and last screw hole center. It is 7/16 wide at the top hope this helps.