Kossel Rod Jig M3 Bolt

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I had modified the original Kossel rod jig for open beam back in the day, but it was specifically designed for a different Traxxas Fisheye ball end model. I ended up remixing it to fit my own kind by thinning out the center pin and widening the head slightly. However, I realized that the center pin might be a bit too fragile, so I decided to upgrade it with an M3 screw and nut combo instead. A 16mm M3 screw should provide plenty of stability and strength.