Makita battery adapter

Makita battery to Ryobi tool adapter

https://www.youtube.com/watch?v=1D4TrLdZCdc

need Makita Terminal 643852 or 643838
or, if you prefer http://www.thingiverse.com/thing:863257

M3 10mm bolt and nuts x 4.
5mm x 25mm spring you can buy on ebay x 2.

optionally:
0.28" digital voltmeter
6 x 6 x 9 mm tactile momentary push button switch.

Sketchup is free software, but if you like, you can go to

https://my.sketchup.com/app

and view and edit on your web browser too!