The 1 mm jeweler's screwdriver points to a small slot below
the main dark slide slot where a tab on the dark slide actuates
an interlock. The interlock prevents removing the back with
the dark slide removed and also prevents the shutter firing with
the dark slide in. Yes, the screwdriver is just right to fudge
the interlock and remove the back with no darkslide installed.
(And yes, that is Ye Olde Photographer's grodiest backup body
and back, currently used with a pinhole body cap.)