Tri-clamp with only two arms?

So, I went and bought a tri-clamp to mount a light on one of my strobe arms. However, I don't think I'll use the light on every dive, and on those dives I'd either run the tri-clamp with just the strobe arms and an empty place for the light, or I'd have to switch back to a normal clamp.

Can I use the tri-clamp with only two armballs, or can it be damaged by that so I should switch back to the standard clamp?

Fill the void with the focus light ball. Alternatively buy a spare ball adapter to fill the gap. Leave the light attached. Buy a normal clamp to replace. I would just leave the light there and use it. I always have a light on my rig, even when it's super light underwater. I don't know you're situation or conditions you dive in, I wouldn't leave an empty hole in the clamp I think you will stress it

I've had no problems so far using a tri-clamp for two arms, did exactly the same thing with my light that you do. I'd guess you would have to tighten the clamp really tight to stress it.

You can always add something like this:

http://www.bhphotovideo.com/c/product/535136-REG/Aquatica_17890_Buoyancy_Compensating_Float.html

I stressed it to control the motion... and it will bend the screw... definetely not recommended