Loc-line rigidity (aka tuning tube turgidity)

[slingshot]

After pricing some arms for video lights (eg ULCS, Ikelite) I'm following in the footsteps of many scubaboard members and building a loc-line arm for my video housing light. It looks good so far, but I've thought about increasing the stiffness of the arm, to better support the heavy Ikelite video light head I'm using.
I've heard that some people put wire inside the tubing. I've thought of using a coarse grit sandpaper to roughen up the contact surface between tube components, or sprinkling some neoprene glue on the surface. I'd love to hear about any ideas or experiences people have had.

 

[thereefgeek]

Here's what I did with my Loc-Line (5th pic down)

http://www.scubaboard.com/showthread.php?t=116450

 

[herman]

I find mine will not hold my strobe up on land but does fine in the water where it counts. I just fold the strobe close to the housing when not in the water. My arm is 13 inches of tube with an Inon D180 on the end. Unless you just want/need the lights to stay put above water, I would suggest you try it first.