I need help identifying this coil balance

A professional from Fuquay-Varina, NC says:
May 9, 2014
I have seen spiral, block and tackle , channel balances but this is my first experience with "coil balances". The attached pics are the parts that basically fell out if the window channel. Once identified I will order them from you guys.

Thanks,

Buzz
User submitted photos of coil window balance parts.
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Paul from SWISCO responded:
May 13, 2014
Hey, Buzz, good to see you again. Let's start by first identifying the shoe. For this kind of balance, you can usually determine everything else once you've figured out what the shoe is. In your case, I think it looks very similar to our 15-180. Carefully compare the dimensions to your own shoe and see if you agree.

If so, you should also consider our Series 190 coil spring, 15-186 coil clip and finally our 15-182 coil bushing. Let me know what you think!
A professional from Fuquay Varina NC says:
May 13, 2014
Hi Paul,

The parts you are suggesting all appear to be what I need. The 15-180, 15-186 and 15-182.. but.. I do not see a stamp on the broken spring I have... can you tell me where to look for it or how else I might determine which series 190 coil spring I need to go along with the rest of the parts?

Thanks,

Buzz
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Paul from SWISCO responded:
May 13, 2014
Sure. If there isn't any stamp on your existing springs, then give me the weight of the sash and I can try to work out what would be best.
A professional from Fuquay Varina, NC says:
May 16, 2014
Hi Paul,

I wasn't able to weigh the sash but it is ~33" tall by ~28' wide.. with a double pane IGU. Do me a favor and just give it your best educated guess which spring I need since there is no stamp on the broken one I have.

Thanks,

Buzz

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Paul from SWISCO responded:
May 19, 2014
Based on that information, the best guess I can give you is your sash weighs 14 pounds. With that in mind, I recommend our S190-740.
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
Coil Balance Clip
Coil Balance Clip
15-186
$5.05
Balance Bushing
Balance Bushing
15-182
$1.80
740 S190 Coil Balance Spring
740 S190 Coil Balance Spring
S190-740
$9.74
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