milgard window sash balance
A handy person from nipomo ca says:
June 19, 2014
the numbers on my 33" sash are 32 4 KW CMC 7. It looks like your 3240 series would work but I'm just not sure
Tom from SWISCO responded:
June 20, 2014
3240 isn't a Series. That stamp just tells us what the spring strength is, though you're right in that a stamp of 32 4 often corresponds to our 3240 option.
I see you were looking at our S350-33. That is a Series. Is that what balance you have? If so, I recommend our 3240 option.