[Jim Dawson]

I added to my last post. I think I'll adjust the design of those to be drawn into a tapered shape so they aren't relying on just bolt pressure to prevent shear slipping as I agree they could get loose over time. A slight amount of flexing is ok as it will make the servo happier when locking, but I surely don't want the joint loosening up

I edited my post above also. Drive pins maybe? A couple of 1/2 or 5/8 dowel pins into plastic bushings might do the trick.