And THAT is why you NEVER chuck an S&D drill in a keyless chuck. If you're lucky, it only ruins the shank of the drill. I saw a nice Albrecht chuck destroyed in this fashion. In the shop where I apprenticed, and later in my shop, chucking an S&D drill (in any chuck) was a firing offense. Hold 'em in a collet or get a Morse taper shank drill.