thank you Johnny 
i really do hope to inspire people into expending the possibilities of the hardware, why let TE have all the fun ?
mechanical LFO motion vibrato
https://s6.gifyu.com/images/758E98F0-6888-48D8-8027-BF1264258A23.gif
i dont have technical drawings for this project.
ice cream sticks are great for consistent size parts.
im sure this mechanism can be improved and can be executed in many ways.