299 DT CMC4 channel balance

A home owner from Daytona Beach, FL says:
I have several broken channel balances.
Code stamped on them is: 299 DT CMC4
They are 30 inches long, and white or metal in color.

Chris
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Tom from SWISCO responded:
Thanks for posting, Chris. Can you show me a few pictures of the balance in question? I will need to see a clear picture of both ends. Can you also tell me the weight of your sash?
A home owner from Daytona Beach, FL says:
I have Har car windows about twenty years old.
Several of the 30" balances are broken.
code on balance is 299 DT CMC 4

Chris
User submitted photos of a window balance.
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Paul from SWISCO responded:
Hey, Chris. Your bottom balance nylon shoe is broken off, so I can't be sure exactly what you have. Seeing as how you're in Florida, chances are you need our S395-30 side load balance. Please compare the nylon ends to an undamaged balance to confirm.
A quick learner from ormond beach, FL says:
Trying to order the replacement channel balance you suggested on March 17th - it's an S395-30. There are option items listed such as 2910, 2020, 2030, etc.
Looks like I have to choose one before the balance will go to my cart. Which one do I need?
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Tom from SWISCO responded:
Your old stamp of "299" uses an old system that is no longer used by manufacturers. One of our standard options may work for you, but you will need to weigh your sash and refer to the chart found on the S395-30 store page to confirm which.
A quick learner says:
I want to order replacement S395-30 balances w/ 1/2" channels.
Under "Options" there are numbers like:

2910
2920
2930
2940
What do these numbers mean?
Are they weights in pounds?
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Tom from SWISCO responded:
The options represent how much weight the balance can support, but they are only representative. We show how much weight each option can support on the S395-30 store page. You can find our chart under the product description. You will need to weigh your sash and refer to that chart to find the best option.
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