Adjustable Foot for 8mm Rails (aka Makeblock)

This is an adjustable foot system for 8mm aluminum rails (a.k.a. [Makeblock](http://www.makeblock.com) ).
Foot comes in three pieces: Foot, Foot Base, & Pin (see picture).

Adjusts from 108mm to 168mm. Currently using to replace stock Makeblock feet on [XYTable](http://store.makeblock.com/xy-plotter-robot-kit) to support larger laser and more room for work surface.

If anyone would like the step files please let me know and I'll post them.