Marble Track

This is a 9.5mm ball track. I remixed it to fit a dc motor with a gearbox. It looks a little worse than the original but the motor I am using is very wide. The person who actually made this said to use  these pieces of hardware to keep the marble lifter attached to the track :

4-40 x 1/2" long socket head cap (2x)
8-32 x 1" long socket head cap (1x)
8-32 hex nut (1x)