I need to replace the spline in a sliding screen door. I was surprised to see the old spline is made in the shape of a "T", with 3 edges. The edges of the broadest surface are about 1/8" from each other. It sure looks like the more common 1/8" round spline ought to fit in the slot and hold the screen in place, but I'd like to know for sure, especially since I haven't been able to locate "T" shaped spline. Does anyone have any experience with this?