I am from the USA and can not find the non-stretch tape used for watch bands or the De Havilland Travel Bag. I have looked at the previous post concerning this topic and no solutions were offered for US artist. The link provided is in a language I do not speak and Google translate did not work. Thank you for the help.
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RM leather sells an option. https://www.rmleathersupply.com/products/premium-non-stretch-tape-high-strength-reinforcement-0-25mm?variant=39677234544749
It comes in sheets not in a role like Phil has in the vids, but does the same thing. You just have to cut it in strips. They sell it in white or black.