Moom Pitchers - A Particularly Handy Small Hand
The arm is 7" overall but you can also get them out to 11". The knob clamping the movement is smooth and positive - no creeping of the arm in operation. If you just need a particularly sturdy column up from the hot shoe, the articulated portion unscrews.
Best of all is the reasonable price: $49.95.
Magic arm. Melissa-approved.