Here are some before and after pictures. Had to use a M6x1.0 die to clean up the threads on the knurled threads. Then used a M6x1.0 Tap on the holes to finish the job. Now the problem is my huge servos don't have 2 flat 90 degree faces. I bought these servos from keling, there the largest he offers. They have a single keyway. I will have to use a die grinder to grind the 2 flat surfaces. the amount of TQ and power the servos deliver, they would spin the set screws without proper flat surfaces.