Yep, the mistake is definitely mine. I built to the plans, which said nothing about hardwood in that spot. Live and learn. I already think I owned it, RCManiac.

Richard, I don't know what size I drilled the thru hole. I'd have to take the plane apart to see. I might do that. My whole point is to warn people that this pivoting can happen if one doesn't do everything perfectly. Thanks for your respectful comments. By the way, hardwood will compress too, over time, and the screws will lose torque. It'll be next year though, after sitting long enough to make you think everything's ok. The only real solution here is to follow the instructions on hole size, and use this hardware only on a surface thick enough to provide sufficient wheel base on the screw. Then, if torque fails, the screw won't pivot. For what it's worth, I think people should know this.