A quick learner from North Carolina says:
May 4, 2010
I need a pair of sliding screens w/bottom track for an existing french door pair. How does the 80-111 install on an existing aluminum threshold?
Dave from SWISCO responded:
May 12, 2010
I believe you will only have to measure and line up where you need the track to be. You will have to drill into the aluminum track with a drill to make the holes for the screws that will be holding down the track. A #6 x 3/4" screw should be long enough