Anet A2 dual Z single motor

I wanted dual Z screws with single motor, and Supasorn's Tarantula solution was very simple and elegant. I remixed this to fit Anet A2. The difference is that on A2 the distance between vertical frame and X bar is bigger, so motor mount and top mount had to be edited. I moved the position only 1mm further out on both, that is enough. I also edited the switch mount to match the switches used on A2 and moved the switch position on motor mount accordingly. I have added a new holder for X endstop sw