Ever done an IBM 5151 monitor? It's painful, and
the details are not in
any IBM manual (for all there's a schematic given).
The thing I don't like about a lot of IBM stuff is the torx screws with a
pin in the middle to stop as ordinary torx bit fitting. (I have been known
to break the pin out and use a torx bit anyway :) The only other way which
usually works is to wedge a flat screwdriver across a couple of the 'teeth'
with its back against the pin, this seems to give enough purchase to turn
the screw.
Regards
Pete