These are probably what you are looking for:

http://www.aircraft-tool.com/pdf/catalogs/ECat2006.pdf
page 75 shows three versions:
-Safety wire drill jig
-AERO SafTblock
-NUT SafTblock


http://www.ustool.com/catalog.pdf
page 96 shows some Drill Jigs similar to what you descibed.


JP



"Michael Horowitz" wrote in
...
Some years ago, I watched an A&P drill a shank so it would accept a
cotter pin.

Was a metal block into which various sized bolt could be screwn into,
each with a hole perpendicular to the shaft that would guide a drill
bit.

Anyone know what this might be called? - Mike