I have a few more parts built, so I put the motor on and ran this test.
The motor is running "backwards" in this test. The long part sticking out from the two moving parts is just a metal rod I stuck in there to make a temporary connection.
A day later, I went ahead and ran another test with another piece added. There is no ball lifter link, so I stuck in a scrap piece of aluminum with the connector holes drilled the correct distance apart.
The motor is going the correct direction in the latter video.