Square check tool remix

See thing http://www.thingiverse.com/thing:1731023 for more information. It has not been tested yet so check the STL object before to send it to your printer.
Did this because I saw the call of the original designer for someone to make a customizer of his thing. As it was a fun little object to do I decided to make it :
- All dimensions (almost) can be customized
- There is a bevel in the rotating part
- You can add a magnet (cylindrical one)