tilt window block & tackle balance
A quick learner says:
September 27, 2014
I have a tilt window with a plain channel and looks very much like the 765 series. It is 21 inches long and on the channel it says w 20 3 ex cmcl. From that info my guess was I should order the 20-3 option and just want to confirm if that is correct.
Paul from SWISCO responded:
September 29, 2014
Yes, a stamp of 20 3 corresponds to our 20-3 option.