certainteed coil balance replacement ?

A quick learner from san francisco says:
Hi, I need to replace my coil balance springs ... I'm certain I have an old style certainteed (without the nub) ...
My springs however, have a 10 J stamped on them ... they look like 171 springs, they are bronze colored, not silver ...

I can't tell for sure though ...

i weighed my window and it was 17 lbs ...
A customer submitted image of their coil balances.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. Don't mind the color, that's not an important factor for this kind of spring. As for the spring, it looks like our Series 170 coil. For a sash weight of 17 pounds, I recommend our S170-409 . See if you agree.
A quick learner says:
Thanks a lot for taking a look ... the S170-409 looks like the best way to go ...

I'll do the experiment !
A quick learner from san francisco says:
i just put the new springs in ... MISSION ACCOMPLISHED !

the trickiest pary was getting the pieces back in the window frame ...

it had to be pried open but nothing broke !
SWISCO S170 and S171 Coil Balance Assembly
SWISCO S170 and S171 Coil Balance Assembly
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How to Replace a Triple Coil Balance System
How to Replace a Triple Coil Balance System
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