http://www.coarsefish.com/Hairrig.htm
i wouldn't bother using the shrink tubing though, if you've not been carping too long.
normal mono would also owrk well for hair rigs.
tight lines
courtz
i find kryston mantis gold good, as it's colour blends into the bottom well.
for mono i normally use drennan double strength over light coulurs lake beds.
tight lines
courtz
it's a helicopter rig, but with the swivel and attatching beads about 1ft away from the lead on the leader. it's good for fishing into silt on leaf debris