Universal Catapult for Seej

In the late 1700s Eli Whitney, the designer of the cotton gin, developed muskets with interchangeable parts to help the United States military. The manufacture of objects with interchangeable parts was soon a key factor in the industrial revolution. Mr. Whitney is perhaps a little anachronistic when brought alongside castle and siege warfare, but we can use the principles he championed to build a better piece of siege machinery.

In this spirit, and on July 4th, America's Independence Day, I would like to share the Universal Catapult for Seej. (More information about Seej can be found here: http://www.zheng3.com/seej/ ). Some friends and I started to play Seej, using the basic set ( http://www.thingiverse.com/thing:24013 ). Maybe it was our technique, maybe it was the rubber bands we had on hand, but we found the rubber-band-as-pivot to be woefully inaccurate and nearly unplayable. I set off to build a better catapult.

After two rounds of revisions, I'm posting the v03 Uni