quite frankly why would u want to anyhow ? drilling forward they will be no swarf clearance
I was just stating that if myself personally have to tap a hole 1/2" or larger I use a keyed chuck for stronger grip on the tap shank I know this from over 30yrs experience of tapping holes daily at work, of course not with hand held pistol drills, ( drilling forward they will be no swarf clearance[/QUOTE] )
do not understand that part of your reply.