Sash balances for 1950s not tilt windows

Home Owner from USA
Just want a be sure I get the right replacement sash balances for these windows. House is from 1951. Appear to be 27" x 5/8"? The ones that have broken have fallen out of the bottom of the sash then gotten bent. No visible markings on the balances, seems like aluminum exterior with steel springs. Thanks!
Spiral balance
6 Replies
Paul
Paul from SWISCO
SWISCO
Expert
Thanks for posting. For old wood sashes like yours, we recommend using our Series 500 spiral balance and 17-012 bracket. If you need help reinstalling these balances, please let me know.
Home Owner
Thank you. Is 27" the correct size to order?
Paul
Paul from SWISCO
SWISCO
Expert
Yes, the S500-27 would be the size I'd go with.
Home Owner from HI
Trying to install the 500 series balances with the 17-012 bracket, but the bracket won't stay on the end of the spring. Am I missing something? The balances I'm replacing have pins through the bracket-spring junction.
Tom
Tom from SWISCO
SWISCO
Expert
The 17-012 should just hook to the butterfly clip at the end of the Series 500 spiral. There's not really any trick to it. Where exactly are you running into problems? 
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