Thought I'd have a go at making a slider today.
Found these old skateboard trucks/wheels, and spent about 30 seconds taping a ruler to them. It just about supported the weight of the 7D.
Here's the first go I had with it...
http://vimeo.com/13555152![]()
(vimeo has made the video more jittery annoyingly...watch it on html5 player!)
And the immense contraption itself...



