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Good point .. dunno why I didn't mention that myself.
And of course that would temporarily avoid the need to remove the 3-jaw chuck.
In which case its worth pointing out that, if you don't have any, it may be possible to buy some additional external jaws to fit your chuck.
I believe the scroll gear details etc are semi-standardised so many aftermarket replacement jaws will fit.
Try RDG tools.
Incidentally, it is also possible to buy soft jaws (rather than the normal, hardened steel items) which can then be bored to any size you like.
This is also a method of ensuring repeatable concentricity when parts are removed/replaced from the chuck.
But note that when you bore them, you first need to tighten the chuck onto a suitable packing piece (short round bar) placed at the back of the jaws while you bore the front section.
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