SWISCO - The Replacement Hardware Authority

Window channel balance, doesnt use your shoes

A quick learner from Seattle says:
I need help deciding whether my existing window channel balance is a series 351 or series 390. The channel balance is 22 inches long and 0.5 inch wide. The problem is the bottom shoe. It measures 1 1/16 inch and its shape does not seem to match either 15-001 or 15-002 shoe. I included picture of the top and bottom shoe with this post.

I see the word "C21" on the channel balance.
User submitted photos of a window balance.
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Paul from SWISCO responded:
The shape may be a little different, but I still think either our 15-001 or 15-002 will work. I'm just not sure which one. Between these two shoes, which is closer to your own measurements? Personally, I think it's closer to the 15-001, but you should measure yours just to be sure. Keep in mind your measurements may not be identical due to wear, so use your best judgement.
A quick learner from Seattle says:
Thanks for your reply. I purchased the 15-001 and it fits fine. The problem I have now is that after installing the new channel balances, the window slides up on its own. Could it be due to the spring being too strong? Any suggestions?
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Tom from SWISCO responded:
Yeah, it sounds like the spring strength might be mismatched. What is the weight of your sash and what option did you select when you purchased your balance?
A quick learner from Seattle says:
I bought the 2140. My window was right around 15 lbs.
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Tom from SWISCO responded:
Hmm... 2140 should be able to support that weight, though I admit that 15 pounds is right on the cusp.

You mentioned that the original stamp is C21. That may be something like a 21C stamp, which corresponds to our 2130 option. Weighing the sash itself is usually better than relying on the stamp, but in this case I think maybe going down to the original 2130 spring strength is your best bet. Also triple check your sash weight just to make sure its not a less than 15 pounds.
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