For information on Seized or Stripped screw extraction see Stripped Screws - Overview. The below information is in addition to the overview article, and is specific to this screw.
Verify the hex wrench is fitted properly into the screw with the short tail so the Ultra-Low Head, M3 x 0.5 Screw PN: 35129 does not strip inside of the NPT Motor Assembly PN: 35277.