IRIS+ long legs

These are top and bottom parts for custom length legs for 3DR IRIS+.
You can use any length of 6 mm diameter aluminium, carbon fiber or wood rod as the leg itself and attach these top and bottom parts.

Use epoxy (or some other glue) on both ends of the rods (actually, my aluminium rods are just pressed into the parts and are plenty tight.)

I'm using an M3 threaded insert (like [this one from McMaster-Carr](http://www.mcmaster.com/#94510a030/=12fmrjl)) for holding the locking screw. You ca