In the details you mention using PC4-M10 couplers with the M14 plugs. The hole in the plug is much smaller than the adapters. Are there variations of the M14 plugs with larger holes to screw the adapters into?
"Tip: If you're using the external spool function I recommend using the M14 with PC4-M10 or PC4-M10 couplers both inside and outside the enclosure, then you can just disconnect the PTFE tubes and lift out the whole Python AMS assembly for easy maintenance"