[wrenchnride247]

Hello seanmc. My suggestion on the hubs would be to contact Lanner at www.vdubengineering.com . As for "spot-facing" that is used when the surface of the material you are drilling through is not square with hole you drilled. All you do is use a endmill bit, or counterbore bit with a pilot installed thats the same size as the hole you drilled. The endmill or counterbore bit should be the size of the washer and bolt you'll use, or a little bigger. This can be done with a drill press or milling machine as long as the part you are drilling is very secure while drilling. After you drill your hole don't move anything, and replace the drill bit with the endmill, or counterbore and "spot-face" to the depth needed to have enough surface area for the bolt and washer to sit flat (square) with the hole . If you have enough thickness on the material you can bore deeper and allow your bolts to sit flush with top of the surface.