The spline needed for my forever door screen is not flat. It is approx1/2 cm or 3/16 in. It is flat on top but has a curve on the bottom side - see picture. Any chance you have this type of spline?
Paul from SWISCO responded:
June 16, 2015
Seeing how yours is "U" shaped, you could consider our 59-190 black foam screen spline. It is a little over 3/16" thick, but since it's foam it easily compresses.