SASH CORDS TOP SASH
Setting sash cords top sash position to attach the rope to the upper sash can sometimes be a confusing issue.
Pull your newly installed sash cord so that the weight comes all the way up, then affix the top at least one foot down.
This obviously assumes new cords have already been installed.
ALLOWING FREE MOVEMENT OF THE TOP SASH
Removing paint from the sash and the beading and frame further assists free movement after setting sash cord top sash rope position, and where to nail the cord to the sash.