In this iteration of the tube light project, I built a motor mount of steel sheet. I ran into some problems trying to get the tension of the chain to the optimal levels. Originally I tried to make it as tight as possible to avoid vibration and have the movement of the light be perfectly aligned with motor. This presented a problem though because the lateral pull on the motor shaft created a lot more torque. The motor only ran reliably at a low speed (although there was very little vibration). Loosening the chain made it run much faster and more reliably, although with more vibration.