Sash Window Balance Springs labeled "CALDWELL"

A quick learner from San Jose says:

Hi

Need your help to identify the following sash window balance springs:

1) "29 5 JQ CALDWELL" [metal shaft measures 30" x 5/8" x 9/16"

2) "28 5 KP CALDWELL" [metal shaft measures 29" x 5/8" x 9/16"

3) "25 5 JQ CALDWELL" [metal shaft measures 26" x 5/8" x 9/16"

There are no other markings on the shafts besides the above. The PVC fittings at the end of the shaft are fixed, not slip-on type.

They are fitted in a home built in 1997. I'm not the original owner of this home so don't have any further documentation.

Thanks in advance

Sash Window Balance Springs labeled CALDWELL
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Tom from SWISCO responded:
Greetings! We recommend you confirm that all three balances have the same top and bottom balance shoe attachments. There is no guarantee that they are all the same.

From what you are showing us here, you may want to go with our Series 380 or Series 385 channel balance, depending on the measurements of your balance shoe.
A quick learner from San Jose says:
Hi Mike

Many thanks for researching my question.

Follow ups:

a) What's the difference between the Series 380 & 385 ?

b) when matching weight of window to a balance, how many pounds over the window weight can a balance be ?
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Tom from SWISCO responded:
The difference between the two balances is the measurements of the shoe. I highly recommend looking at over the hardware on our site, we have detailed information for you to use as a reference.

You don't want the spring to be too strong. You can see a chart on each balance's store page that shows how much weight it can support. Once you have your sash weight, just look over that chart to find where your sash weight falls.
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