Mixer for PCB etching

I needed a very simple shaker that I could make at home with what I had. 
I used a servo motor (SPT4412LV-210), Arduino nano, a type C port and an aluminum bar found inside a CD player that I disassembled, 85cm long with a 3mm diameter.
Assembly is very simple. just insert the aluminum bar while aligning the top with the bottom. The motor needed can be fitted between the side rods and then closed using the horizontal bar.