I recently acquired several older Graflex 120 roll film holders and I would like to add an end tab holder for the roll film tab to identify which film is in in each holder. I tried Porter's and B&H with no luck.
By cementing plastic strips of two widths together you could make a profile from which by adding a single width piece you could construct a frame to insert the tab, similar as with that holder for part of 35mm film box.