Tapered thread bowden coupling PC4-M6

This is a printed part for bowden copling PC4-M6 used on Ender 3 extruder.

First you have to remove the plastic pieces (without the rubber piece) inside the PC4-M6 bowden coupling that came with the printer which is well known for the poor holding of the teflon tube, then you need to apply some good quality epoxy glue inside the printed part where the PC4-M6 goes in (lookup in the pictures).

In my case the epoxy took 2 days until was completely hardened and now the piece is mounted on the extruder and it holds pretty well.
(Sorry if i misspelled some words, i am not a nativ and my english is a little bit rusty)