Y tensioner for Anet A2

This is an Y tensioner module that fits Anet A2, Tevo Tarantula and possibly other printers that are using 2040 extrusion on Y axis.

Inspired by Banholm's Tarantula Y tensioner http://www.thingiverse.com/thing:1704100, but I didn't like the size of it... it's HUGE. So I went on to create my own, more compact version, which doesn't share any parts with Banholm's.
The sideplates are same height and just 10mm longer than A2 stock sides (72 vs 82 mm). It has 10mm of adjustment, which is plenty f