if anyone having trouble to insert M4 nut into the PTFE (as mention on manual), i made this easy DIY holder nut.
i designed with a chamfer in a hole, to make it easier insert the PTFE into the nut. its very fit and not sliding in PTFE.
i print it on my PRUSA I3 MK3S+ well calibrated, so it fits perfectly (feel free to rescale 102% or 99% to match your machine tolerance)
Print settings : i recomend 0.15 LH and PLA+ material.
The author hasn't provided the model origin yet.