I'm new to all of this so please bear with me. I have a new Taig CNC mill I took apart my z axis to clean and lube. I've adjusted the gib so that the carriage will stay up under it's own weight but I can still slide it by hand fairly easy. I find I have some play (.001) when I twist the carriage. Is this sufficient or do you think I need to tighten the gib some more?