With this:

and this:

I should be able to do all my own keyways now, yay.
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Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.

Nice going with the Dremel in the lathe! That should work as a general purpose toolpost grinder too.
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

Good thinking.

Now see how you can make taperlocks. Then you don't need keyways.