Hi Stewart,no problem with chuck falling out?When I started milling I didn’t know anything about collet chucks,and half way through my first job the jacobs chuck fell out,the job survived(sort of)the 1/4″ slot drill survived,I got a collet chuck with draw bar.Nice wee wheel.If a method works for you (or me) its ok even if some would say you can’t do it that way hi.IAN S C