The spring is too strong on my channel balance

A handy person from Malabar, FL says:
I have pictures of the type balance I need but the spring is too strong. The window weights 30 pounds. The Id marking is 29 9 KW CMC 11 and the length is 30 inches. Can you suggest a replacement. I think the repair man used what ever balances he had on the truck. I have replaced many top sash guides that were damaged because the spring is too strong.
A customer submitted photo of channel balance attachments.
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Tom from SWISCO responded:
Thanks for posting. Before we can offer any suggestions, we need just a little more info regarding your bottom attachment.

Please refer to the following chart and identify the part that most closely resembles your shoe.
A SWISCO guide to identifying balance shoes.
A quick learner from Malabar, FL says:
As to your question 15-005 is the correct bottom.
It is 1" wide with wings.
Earl
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Paul from SWISCO responded:
Thanks for the information. Please take a look at our S385-30 with a 2950 stamp option.
A handy person from Malabar, FL says:
I just put in two S385-30 channel balances. They appear to work fine but the spring is noisey when shutting the window. Did I miss something or is that common for replacements.
Earl
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Paul from SWISCO responded:
I think that the issue here is that there is no knot relief hole in the jamb, so there is undue strain on the string. You will have to drill a new hole directly in the jamb where the knot is located to relieve it of the stress.
A handy person from Malabar, FL says:
Can you show me where the hole should be. There are two holes located where the hook goes and I have the hook located in the bottom hole.
Earl
A quick learner from Malabar, FL says:
After asking about the spring noise and receiving your comment about drilling a hole. I remembered there were two holes in the jamb and I had the balances in the lower hole. I moved them to the upper hole and now they make very little noise and work fine.

The ability to obtain advise on selecting and installing your products is invaluable. Later I will replace the rollers on my sliding glass door. Guess where I will order my parts from? Thanks, Paul.
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