Question for the trained machinists, what's the correct sequence for say holding and making or modifying a thin walled part on a lathe? From my own experience, I know that a 3 jaw chuck is far from ideal for say holding a some what thin hollow tube, chances of that not deforming are slim,....I don't yet have a collet chuck for my lathe, if I did, what thickness of material could you get down to/get away with shall we say?? I've just made this sleeve/adapter part from a scrap piece of solid bar, drilled/bored the hole first then cut the internal thread, turned the outer diameter down to size before parting off. The final walled dimension is just over 1.5mm so maybe not that thin/risky when it comes to steel? Could I have drilled/tapped right the way through without fear of the part deforming?? What if it were say delrin, any tips/guides on what you could go down to size wise with which material without it screwing up?