What stamp Option

A handy person from Bonita Springs says:
I need to order S380-37 Channel Balances. The stamp on the old balance says 3635, what stamp option should I order?

Thanks,

Tom
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Paul from SWISCO responded:
Thanks for writing in, Tom. That is an interesting spring weight stamp number. It falls between (3630) for a sash weight 18-23 lbs. and (3640) for a sash weight 23-30 lbs. The best way to decide which stamped option to choose, you will need to weigh the sash.
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