Need help with stepper motor & safe idea

I need a DC stepper to make the lock for a small timer safe. Think of a flat
piece of steel about 2" x 1/2" . I drill a hole in one end and slip it onto
the shaft of the stepper then attach it there. Then mount this on the door
to rotate into and out of a slot on the jamb -- just a very simple kind of
latch that will toggle open or closed w/o power having to be continuously
applied.

How does one normally attach something to the shaft of a stepper -- can I
just weld it? What diameter shaft makes sense? Where can I get a stout
battery-operated stepper (i.e. can you help me filter the Google hits?)

What would work better than this dumb idea? (Note: the safe uses an INTERNAL
timer and battery. It must be able to latch or unlatch and STAY that way w/o
power being applied until somebody opens the door.)

Thanks.

Sammy


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