Are there any established (compact and simple) solutions for turning two 5mm rods/shafts side-by-side together by driving a singe motor? The torque is about 5kg-cm. The one I'm thinking of is the coupling rod:

[![enter image description here](https://i.stack.imgur.com/JFAVT.png)](https://i.stack.imgur.com/JFAVT.png)

Are there disadvantages to this solution compared to others, e.g., gearing?

If the coupling rod is a good solution, where could I get my hands on those "tabs" where the coupling rod connects? Is the coupling rod supposed to be connected using some small shoulder bolts and nuts?