A few months ago I posted how I do it with my Hex 3. A brief summary:
If you have 3-section poles, and can remove the tip of one of the poles:
1) remove the lowest section from one pole (the section containing the tip).
2) On the second pole, remove the tip (I can remove the tip from my Black Diamond poles by stepping on the basket and lifting up on the pole -- the entire casing comes off the aluminum shaft.
3) Insert the lowest section from the second pole (tip removed) into the hole of the first pole.
This should create one long, solid rod, with both ends containing the grips. Adds zero weight and is extremely stable.