Black & Decker Compact Power Screwdriver "drill chuck wont tighten" Questions

...chuck of the screw drill wont tighten The outer sheath of the chuck turns a thread on the back of the jaws in the chuck and it it is not tightening correctly then the jaw threads have been ...

...drill holes - what am i doing incorrectly chuck problem replace it, 4 1 thing is the drill smaller than the drill PORT/HOLE in ur drill.? or the drill PORT/HOLE to small for the drill bit? ...