Jacobs Chuck Key Size?

That arbor you have is removeable.
 
Ah, yes, I read the thread about removing them--wedges, hole drilling and such. I expect it would come off pretty dry--looks like it's been on there since the '50s. For my use, I think the MT2 can stay on--I have a MT3 to MT2 adapter if I want to mount it in the headstock.
 
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