sash weight

A handy person from Lehigh Acres, Florida says:
January 31, 2017
I ordered 2 window 29 inch series 380 channel balance and 2, 18-180 top sash guide but the window still falls down. the stamp on the broken balance is 28D you must have sent the wrong balance What one do I need?

Thank you
Tim
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Tom from SWISCO responded:
February 2, 2017
Thank you for contacting us. We have reviewed your previous order with us. Back in 6/15/2016 on order #76913, you ordered Series 380-29" with a spring weight (2810). (2810) spring weight has a sash weight range 7-12 lbs. The original balance had a stamped number 28D that would be our (2840) for a sash range 23-28 lbs. Please weigh your sash to see if it matches (2840).Please get back to us and let us know if you should need any additional assistance.
29" Series 380 Channel Balance
29" Series 380 Channel Balance
S380-29
$11.10
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