Paul from SWISCO responded:
November 1, 2016
Could you confirm the length of your metal channel? Based on your stamp, it should be 29" long, not 31".
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Casey from SWISCO responded:
November 2, 2016
To determine the option you will need for a 31" Series 751 balance, remove the window sash and place it on a scale.
This series 751 ribbed channel balance also known as a block and tackle balance has a 31" long metal ribbed channel and is for a tilt window. This balance comes fully assembled with a 15-014 shoe. The channel width measures 9/16" but is considered 1/2" in the trade.
*This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
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