751 Ribbed Tilt Channel Balance with the 15-014 Balance Knife Lock Sho

A quick learner from Los Angeles says:
Im sure this is what i need, but how do i determine the correct weight specification,i have attached a photo of old sash balance it has a stamp 34XHD2, although when measured it is 35 inches long, please help, and i will probably order aproX 30 of these. Thanks!
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Casey from SWISCO responded:

Hello,

The number stamped on your balance and the length shouldn't match. The number on the metal channel refers to the glass height. For the spring weight, your 34XHD2 stamp means you'll need our 34TG option. Thank you!

How to install a ribbed tilt channel balance with knife lock shoe
How to install a ribbed tilt channel balance with knife lock shoe
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