Replacement Coil Balance System

A home owner from Elkins, WV says:
June 22, 2019
Hello,

I'm looking for some spares of this assembly. From what I've found on the site, it appears that the 15-177 coil balance shoe will work. However, I can't determine the coil spring balance weight. I see a "6K" stamped on the end of the outer spring. Thanks for your assistance.
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Bob from SWISCO responded:
June 26, 2019

See our 15-177 Coil Balance Shoe. Look it over to confirm it matches your old hardware. This coil balance shoe is compatible with our Series 152 Coil Springs. If you have one with a stamp of 6', this indicates that one of the springs you need may be our S152-6, which supports of 6 lbs of weight individually. Look for another stamp number on the other coil spring. If there is none, or you are unclear, weigh your window sash. Give us the exact weight of the sash, and we can work out the spring weights you need. 
Coil Balance Shoe, Slate Blue
Coil Balance Shoe, Slate Blue
15-177
$3.47
6 lb Series 152 Coil Balance
6 lb Series 152 Coil Balance
S152-6
$4.80
#8 x 3/8" SS Pan Head Philips Screw
#8 x 3/8" SS Pan Head Philips Screw
33-072
$0.30
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