How to make a 6xAA carrier work.......
Drill a hole in the side of the carrier to use a zip tie to strain-relief the cord.
Use heat-shrink wrap to protect and reinforce carrier leads.
Avoid using carriers with 9V battery snap connectors.
And warning - using certain batteries, or perhaps just bad luck could cause your MS 900 light burn out. I recommend against using "high power" setting when using AA batteries.