Quoted from PinMonk:The video is the same. It's a machine screw, so I'm assuming a T-nut or lock nut under the playfield at the very least, but a T-nut would be better than a lock nut, but still not sufficient given the large size of those holes.
Ah ok, the way heard him he described how only a couple threads held that post in to the t-nut and nothing else. Whereas mine is; post, washer, t-nut, lock nut. My misunderstanding.