Can't find correct flat spline!!
I live in rural PA in a home built in the early 1990's & am trying to find replacement spline for my screen door (replaceable screen/storm door) and i am not having any luck anywhere. I need a "tape" type spline however am having no luck at any of the hardware stores nor on line. I tried a rubbery 5/16" width product from Amazon, to no avail It's a heavier plastic spline measuring a little better than 3/8". Please see the attatched pics of the spline & hopefully you be able to help me out with this.
Thanks so much!!