Yet Another Guitar string winder

I wanted to create my own guitar string winder.
**NOTE: the models are based on the size of the guitar showed, that is a [3/4 guitar from gear4music](http://www.gear4music.com/Kids_Electric_Guitars/Solus.html).** Normal guitars should have bigger keys.

**UPDATE 2015/08/10** - I added a *version 2* with a reduced length of the crank. Based on my printed version 1 I also reduced the dimensions of the key and the clearance of the hexagonal connection.