Best way to texture heat-shrink handles?

[Clead]

Hi guys, I've been playing around with some 2:1 Raychem heatshrink that I have an unlimited amount of , and I was wondering what you guys use under the tubing to get a better grip. It looks like some guys are wrapping wire underneath for a spiral grip.. what gauge of wire works best?
Any ideas are appreciated, and this will be a handy thread for anyone getting sweeper bristles from me because I'll be packing every envelope with these 1" pieces of Raychem 1/8 2:1.

[ToolyMcgee]

I actually use a thin steel craft wire. I think it is used to bind silk flowers together in bouquets. Any wire will pretty much work. I just use the steel because it lets me wind the handles tighter without breaking.

[criminalhate]

I use 20 gauge solid core to wrap mine I have also used and been happy with 22 gauge solid core.

[ToolyMcgee]

So, I checked the gauge on the craft wire. 22...

Somehow I am not surprised.