I am setting up a 12CK in my shop from my dad's shop. I have a lot of MT4 & MT5 tooling and drills. From what I can tell the head stock in the CK is a Jarno #12(short) and the tail stock is MT3. Has anyone bored the headstock out to an MT5(short) and the tail stock to an MT4? If I bored out the whole length of the headstock spindle to 1.5" would that weaken the spindle too much? Any thoughts would be greatly appreciated. Thanks