One good hard chuck key to the nuts is all it took for me to never forget again. At least the other lads in the workshop had a good laugh.Took me just three classes on the machining course I took two years ago to fall for that one. Luckily it got shot to the opposite side of the lathe I was standing by. Now I have it secured to the base with an elastic cord, following my trainer's suggestion. Every time I need to adjust the Chuck I have to pull the key to it.