From time to time I mill a blind slot in a shaft and fit a key to it, usually a 1/8" to 5/16" key. My current method of rounding the ends of the key is to do it by hand on the bench grinder but I find it hard to do a neat job plus its fiddly and slow. Does anyone have a quick method or nifty homemade gizmo they use for rounding the ends of key steel?

This blurry photo almost makes my key look respectable.

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