I watch but don't contribute because I don't have any CNC stuff yet. BUT.. I have destroyed several flexible drive shafts and chucks simply because they aren't up to spec to do a decent job. I don't work them too hard but when the drill breaks through a piece of material it works it's hardest at that moment....that's when the flexible drive tends to fail. I'm guessing that the spiral winding of the flex shaft is configured the wrong way and it unravels and fails. Too bad. What I'm asking is --- Does anyone know of a decent flex drive and /or can anyone recommend one please.