Coil Balancer series 152

A quick learner from Hartford CT 06114 says:
I'm trying to identify the pound strength I should use to reorder and the only mark I see is the letter F. Help!
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Paul from SWISCO responded:
Hmm... "F" may represent a strength of 6 pounds, which would be our S152-6. How much does your sash weigh? Keep in mind that each individual S512-6 spring can carry 6 pounds of weight each. For example, if you have one spring on each side, and if your sash weighs 12 pounds, this would be the perfect choice.
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