the gantry side pieces, and the router x-axis end pieces are glued together i use Bolts to apply pressure while glueing these.
the u bolts i used are slightly larger than the designed holes because thats what is readily available to everyone and i stood them on the side and used a hammed and strike it at the p.c. (Point of curvature) to make the bolt narrower, then spread the threaded area back out to proper width, this will need to be repeated until desired results.
the double nuts will lock against eachother and i have not used and washers or tocktight on them, they sit onto the center race of the bearing.
hope that helps
Joe
Edited the word bolts for those who needed it.