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Agreed, here's a list of things I've tried unsuccessfully:
1) 1/8"-27 NPT
2) 1/8"-27 NPS
3) 1/8"-28 BSP
4) M10x1.0
5) -3AN O-ring boss (3/8-24 thread)
Of all those, 1/8"-27 NPT was the closest fit, but would only engage about 2 threads. I eventually got fed up with it and just cranked on it...