The screws that hold the skid plates are not tapped, they use a self tapping screw. On my machine I did retap all the holes and went bigger and added additional holes for added support. I used a 1/4 - 20 thread oversize round head bolt. Much better and stronger than stock. Frame is thick enough to hold threads. If a bolt snaps off, use a drill to drill out broken bolt, when the drill grabs, it will thread the broken bolt on thru so you wont have to retap. Sounds like a lot of extra work but well worth it in the long run.