For my Necromunda Arbites, I've used the following method:
I took a Space Marine Chainsword arm, and cut off the chainsword, leaving the handguard. I then pinned a length of 2mm plastic rod to the hand, and used a shorter length of matching plastic tubing to fit snugly over the end of the rod.
This was then capped with a 3mm plastic rivet head from the Tichy Train Group (but any (semi)spherical bit could be used of course).
I also planned to add some wires glued to the rod, but in the end didn't bother. Still; it could work to add some more detail and I still might revisit them at a later date (they're not painted yet anyway; it's one of those projects...
).
Once I get home tonight I'll take a picture to show the result