Variable length arm for Round-a-mount (RAM) mounting system

Parametric length arm for a RAM vehicular mounting system, which goes between two rubberized balls - https://web.archive.org/web/20150525081405/http://en.wikipedia.org/wiki/Ram_Mounts

This item is ment to replace (functionally) the arm of a RAP-B-166-2U set - As such, it works on 1" diameter ball joints and the system is rated for support of 5 pounds or less.

Edit: Attributed [Catarina Mota's](http://www.thingiverse.com/catarina/designs) hexagon function the way I should have from the beginning. Functionally, the file's the same.

Changed 4/12/14 to allow the option of a bolt/wingnut combo at each end instead of just one in the middle .

Changed 6/8/14 to offer a range of bolt size options.

Took off 'work in progress' tag 4/20/2016 - Lots of downloads and relatively little feedback - I'm going to call it done.