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Paul from SWISCO responded:
September 27, 2019
For a balance marked with "27 3", you want to go with a 2730 option which holds a sash weight of 13-19 pounds. Looking at your balance, it does seem that our S351-28 does look compatible. You just want to make sure that the depth of your bottom shoe measures 1", like in the diagram below. 
Detail of 15-002
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