Channel Balance help

A quick learner from San Diego, CA says:

I recently ordered and received a 31" Series 385 Channel Balance S385-31 option: 3030. I installed it without any problems. I was very excited about repairing the remaining windows in my family and dining rooms. I ordered six more pairs and began installing them. Unfortunately I have had some difficulties.

I had one of the new balance channels pop out of my hand and into the window casement, breaking the plastic balance top and snapping the clip attachment inside the casement. I decided to check the weight of each window. It seems they vary in weight, but average 24lbs (bathroom scale accuracy????). This is heavier than the original window.

Is it possible to use the 3030 or do I need to order 3040. The first window lifts like a feather the two others are more difficult but moveable. Also may I order the balance top to replace the one I broke or does the whole balance channel need to be replaced?

I know so many questions ... but I do have one more. I need a top sash guide for the window but cannot find one similar to it in your catalog. I will attach a photo in your identify part section in hopes you can identify it for me. My San Diego home is 11 years old. Any help or advice would be greatly appreciated.
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Paul from SWISCO responded:
Hi, Judy. Yes, the same stamp won't necessarily work for each sash. I wouldn't try to average things, either. You should weigh each sash and only choose the option that will accommodate that weight. If you go any higher or lower, then the hardware may not work properly and may even damage the window, as you've seen.

You can replace the broken top attachment with our 19-005 and 62-005 rivet. See the video below on how.
I believe we just answered your question about the top sash guide. You can view our response here.
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