Since there continues to be interest in this I'll fill the group in on what I
found and what I hooked Scott up.
Wiha makes a 3/16" nut driver that is small enough to do the DB9 males. It's
about $5. Details at:
To help Scott with doing production I decided to get him something he can put
in a torque limited electric screwdriver. I bought a 1/4" drive 3/16" socket
and a 1/4" drive to hex (screwdriver) adapter. Cost on these was about $2
each. I then turned down the outer diameter of the socket on my lathe. The
turning down took about 2 minutes, it was just the 30 minute trip to the
store that dominated the project.