Anderson window sash balance
A handy person from vernon, NJ says:
September 29, 2013
in my Anderson window was a sash balance with the following markings: BL8 10# 31 85. What replacement sash balance should i use/
Tom from SWISCO responded:
September 30, 2013
I recommend our 24-1033. This can replace Andersen sash balances with the stamp 10#31.