3 points Printbed leveling (Protos)

I create a 3 leg version for my new printer from the 4 leg version
http://www.thingiverse.com/thing:229643

I put all improvements from my Prototypes inside but I never Print it again.
So please let me know if there is still an issue in it and I´ll change.

Shold be also works for all Printbeds with 230x230mm ( 215mm distance of screws).