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@TheBrick(Tommy)
cool well done Max, I have read a post on bike forum about soem guy doing this with a track cog, I thinck he had to heat it up to remove the hardening drill it then tried to redo the hardening by re heating to blood read and quenching. Difficult to get right with back yard engineering set up. Your method looks good and like you say because the cogs are cheap you can just replace them reguarly with out worrying.