About this 3D model

If I had a motor with more torque it would work, but I don't. So, we're left with something that moves up and down really fast. This design is meant to house a 9v DC motor and a 9v battery. My dream idea is to make a scrubber strong enough to actually clean standard dirty dishes and then attach it to a programmable robot arm. Just another step towards home automation! Check it out in action (without sponges): https://www.youtube.com/watch?v=ojeUOLK0EWY&feature=youtu.be