There's other ways: you can use 3mm (M3) screwthreaded rods, as illustrated below (pic courtesy of
Overclex.net). Just feed them through carefully...
I have found another way, but it is a bit hard to explain, and I can't be bothered to make complex drawings right now. Suffice to say that it involves hooking the edges of a shroud behind the lips that the mounting holes are drilled in, and wedging a securing strip over it... If that makes any sense.... :shrug: