Dan,
We had a similar incident and roadside fix for someone on the way home from Vegas. This was a CNC M/C too and the pushrod locknut had worked loose allowing the pushrod to work itself undone. I can confirm it was metric thread, but not what size.
It's a tight fit up under there to get it all together. I actullay pulled the master cylinder away from the firewall and had someone hold the pushrod from outside while I worked under the dash.
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