for two others that are better close ups:
Found on http://thereifixedit.failblog.org
Kevin Chen posted about this... and got to the bottom of the concept, it was made for the 2010 Portland Soap Box Derby, and it won the best engineered. http://thekevinchen.wordpress.com/2011/02/03/rollin-on-barrels/#more-5486
Kevin Chen posted about this... and got to the bottom of the concept, it was made for the 2010 Portland Soap Box Derby, and it won the best engineered. http://thekevinchen.wordpress.com/2011/02/03/rollin-on-barrels/#more-5486
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