Cool LEGO Robot Skeleton Arm Keeps Your iPhone Steady

Assuming that the price of Tiffen's soon-to-be-released Smoothee iPhone Steadicam would be beyond his budget, Babyology writer Ben Gurnsberg built this amazing iPhone steadicam robotic arm out of spare LEGO Technic pieces.
It looks cool, but how'd it work? Not well, says Gurnsberg.

Unfortunately, this story has a sad ending.  I forgot to take one small thing [...:]