Here is our hook. It is made out of 1/2 aluminum round stock. IT is just like a body clip.
The diameter of the opening in the hook is smaller than that of the bar therefore it snaps back around the bar attaching us to the bar.
(the only way to get us of the bar is upwards....)
here is the link:
http://www.tahsroboticsteam.org/Pict...n/100_0712.JPG