option for replacement sash balance

A handy person from Hawaii says:
replacing sash balance & am not sure what option I should choose. Codes on old balance are 27, 4,
BSI or 1 & 0 or O P
Thanks for your help.
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Tom from SWISCO responded:
For a stamp like 27 4, I recommend our 2740 option. You can always weigh your sash to confirm that this is correct.
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