for those of you who have made double sided calls, ( not the true double siders with full size striking surfaces ) but rather the calls with a 2" hole or so that is able to play on the bottom side. i was curious, do you use like a 2" fostner bit to drill the blank and then chuck up that with the inside grips on a 4 jaw? or do you outside grip the whole blank, and turn down your center hole on the lathe, and then re-chuck it to turn the exterior ?