Sash Support Coil Balance

A home owner from Kill devil hills nc says:
Two coils 1.#6.5 35"
2.#3.5 35"
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Tom from SWISCO responded:

Your shoe appears to be a match for our 15-199. This is designed to work with two sizes of coil spring: the 1/2" thick Series 165 and the 3/8" thick Series 160. You'll have to measure your original spring to confirm the better choice.

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