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Milestone Series 1000 Channel Balance

A home owner from Tampa says:
I could use some help identifying the correct channel balance. I have narrowed it down to an S380-29 but I don't know what the correct weight range is. My existing channel balance is stamped with 28D. The SWISCO options are 2810 thru 2860. Do you know which option correlates to a 28D?
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Tom from SWISCO responded:
A stamp of 28D usually corresponds to our 2840 option. Just weigh your sash just to make sure that's correct.
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