All alm double hung from early 70s no markings

A landlord from Naugatuck says:
Looking for 3 pr
Spiral Balance
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Paul from SWISCO responded:
We may be able to custom make this balance for you, but before we begin can you tell me the length of the tube and the length of the inside spiral? Can you also tell me the weight of the sash? Finally, how many did you need?
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