Tom from SWISCO responded:
June 30, 2017
A stamp of 14B is weird on a balance with a 17" long metal channel. If you're sure it's a 17" long, Series 751 then I would recommend weighing your sash on a scale to confirm the best stamp option. You want to be careful when choosing the stamp option, since it is possible to have one that is too strong. More support isn't always better. A spring that is too strong could prevent you from closing the window entirely.
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