That center piece doesn't come out?
That looks like metal in there, and the ones I have dealt with has a felt button that comes out and the screw is under it.
This is with the felt removed. I don’t know if it’s Pressed, or if there is a set screw in the side. The distributor came with the car when we bought it brand new in a box. I don’t know if it’s a pro-form, or what it is. But it works great. We just needed to limit the timing.
We haven’t remove the distributor from the car yet. That will probably be Sunday. But isn’t that the craziest thing you’ve ever seen?
