Bosch mid-drive e-bikes use a goofy Bosch proprietary wrench to hold the front chainring on.
Rather than spend $60 on a tool I used $4K worth of machine tools to make my own.
I traced what was needed onto paper, and then transferred that to a steel slug. The milling was done manually and largely by eye. The final fit required a lot of filing. Since then, I've acquired a rotary table, so would be able to by much more accurate.
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