A further complication. I removed the two extra posts and the bare screw. As expected they are wood screws. I attempted to remove the single ring post and figured out either the machine screw or t nut are stripped. To make matters worse the t nut is covered by the plastic ramp that runs from the upper playfield. Based on a quick look it seems removing the ramp is major undertaking.
I’m inclined to cheat here. If I cut off the screw head I can remove the post and then cut the screw off at playfield level. I can then drill a new hole close to the old one and attach the post using a wood screw. Post should cover the old hole.
Am I missing something?