With a 26 year career as a General Machinist at Boeing, Kevin Bethards knows a thing or two about CNC. Owner of a PCNC 770 with a 4th Axis, Bethards has a small home machine shop where, using a custom dovetail fixture for his 4th Axis, Bethards milled a spark arrestor for a YZ250F motorcycle. “I came up with the idea for the dovetail fixture based on something we use at work, but I just scaled it down a bit.