Interesting Rhino, I thought it was the newer gen that the Army issue in certain units (titanium one) Like this
Still stand on my point though. The rhino is pretty poorly designed the fact that the force to overcome system can be move by simply rapid moving of the head is a good indicator.
I run the Wilcox G11. Much more solid design than the rhino. The only wobble that remain is at the j-arm where you can switch between left and right eye (though the switch to the softer o-ring pretty much remove that)