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It is advisable to use nuts with a nylon insert to avoid self-loosening (although I doubt that this will happen).
I used Flange bolts and Flange nuts to prevent self-loosening a nut.It is advisable to use nuts with a nylon insert to avoid self-loosening (although I doubt that this will happen).
I have made backup seed phrases using M8 Flat Washer 1.5mm (galvanized iron plate) and 2.0mm (304 Stainless Steel M8 x 24 x 2.0mm).
Here are some of the equipment and results that I have made:
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The example seed listed above is only for initial testing, while a backup of the original seed phrase using the washer is stored in the safe box.