Z axis fine adjustment , prevent misalignment

If you like my design please don't forget to give me a boost! http://www.youtube.com/watch?v=hOyFPLdesmIWith this you can have a fine and always synchronized adjustment of the two motors of the Z axis, It happens to me that after some impressions a motor of the Z axis stays a few millimeters de-synchronized with the other motor which makes me try to calibrate the Bed when this really is not necessary simply just have the two z axes synchronized.To place the pieces, first it is necessary to adjust the axis so that the two towers are at the same height, later leveling the bed and leaving the calibration as much as possible. Once this is ready we make a small notch in the acrylic chassis of the printer and with the pin we leave the best aligned with that notch, so whenever we want to print something when we do a home all we will see if the axes are perfectly synchronized.Con esto se puede tener un ajuste fino y siempre sincronizado de los dos motores del eje Z, A mi me pasa que tras a