I saw these the other day.
Mach3 2010 Screenset
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
I use metal all-thread couplers...
You can get them down to 4-40.
The nice thing is that they are all the same length - give or take a 0.001"
Ok - they are conductive, but they make a quick stand off for boards.
CNC Is Not Just My Passion.. It's My Addiction !!!!