Anet A8 Y Belt Tensioner Improved

Hi.

I recently bought my anet, and started printing some upgrades.
One of those was a belt tensioner. I printed 4 of them (all available here). However all of them broke a few prints later, and the last one didn't even fit the Anet A8 (even been designed for it). So I created my own from scratch, based on the A8 original one.
On of the problems of other designs is the pressure angle (I did the same mistake on my first test). As the belt is above the 4 square holes, the tension made is somet