window balances will not stay up

A contractor from princeton nj says:
i have some caradco double hung windows
they do not stay up
how do i go about fixing the balances
are the springs changeable or do i change the hold plastic track
thanks for your help bills carpentry
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Paul from SWISCO responded:
It sounds like you need new balances, yes. Please show me a picture of the balance in question. Please also give me the length of the tube (not counting the two end caps). Please also pull down the bottom nylon fitting and tell me what color the spring tip is painted. Thanks!
A contractor from princeton nj says:
here is the info you needed

down stairs windows
springs are 20" long
colors are black and purple both the same lenght
upstairs windows springs 17" purple
and 18 1/2" red
also will need the plastic runner that the window hooks into

User submitted a photo of a friction shoe.
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Paul from SWISCO responded:
Oh, I see. I apologize for the confusion, I thought you had a different type of balance!

The part you have pictured resembles our 15-104 friction shoe. I believe you can use this as a replacement. I'm afraid we cannot replace the springs themselves, though. You would need to contact a local mill work who still makes wood windows and have them replace the jambs.
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