Ball-powered pendulum timer (parts variation/update)

My son and I wanted to build Shiura's awesome "ball-powered pendulum timer" for the tech fair. The good news is that we got it to work- but it wasn't easy! For anyone wanting to do the same, I've put our adjustments to some of his parts here. Honestly, it's all about getting things drilled perfectly - which is beyond me. Using these parts as needed makes things a bit more forgiving. Here is a quick run down:

Washer v4: I've included the new washers I made that work right off the bed. One is double thick. Space things as needed to account for the slight discrepancies in your drilling.

New Base v1: The wider base gives more room for the mechanism to do its thing. (This was a suggestion of Shiura.)

New Lever: I adjusted the lever to firmly fit into the eject rail making gluing the two together about million times easier.

New Pen: This pendulum is deeper so that it can reach the escape wheel if/when things get too spread out.

New Pen Pin: I think this is just the "axis fix"