Well, I Just Screwed Up My Spindle.

Duh, missed that it was a mill in question & not a lathe. But what I posted could still be done if you have a lathe large enough to hold the spindle.
 
Next time just carefully file the little high spots off. R8's have a key way so they can't get loose and rotate,galling the taper. Probably you can only get the #3 MT for your machine,though.
 
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