May want to take a look at these as well.
http://www.thingiverse.com/thing:1001065
http://www.thingiverse.com/thing:794261
Type: Posts; User: RWReynolds
May want to take a look at these as well.
http://www.thingiverse.com/thing:1001065
http://www.thingiverse.com/thing:794261