Being an ardent competitive CL flier from early '50s through the early '70s, back in about 1959 I purchased a 1000 ft. long X 3" wide roll of aircraft pinking tape for around $5 back then. For many years all CL hinges, (flap, elevator, etc) were made from this material. In addition all fuse./wing/stabilizer joints were reinforced with the material. Same for cowls, and front-ends. I still have about a third of the roll. I use it sometime when I think about it for reinforcements, however now I prefer fiberglass or other newer technology material. If I were to build additional CL models that I planned to dope, then I would again use the pinking tape.

I think SIG still sells the pinking tape under packaged CL hinge material. Linen such as heavy handkerchief or bed sheet works well, however that linen needs to be used with dope finishes or several clear coats for the material and should be cut on the 45* to the grain/thread.