Hooking of screws on the bottom of sled

Which screws is everybody using under the router to keep the sled from hooking into grooves and surfaces?

With the Ridgid Router I had to get longer screws (1" i think). I also got washers, and counter-sank them into the 3/4" thick sled about 3/8". I also added wax to the bottom of the sled to help it along its path.


All my bolts I counter bored them then put a heavy chamfer on the edge. Also chamfered the sled outer edge as well as the center router edge.