Replacement the damaged/broken plastic fitment with a new one made it from a piece of aluminum using simple tools;
Hacksaw, file, drill press, drill bits (ø3 - 4.2 - 5mm), m5x0.8 tap and a cutting/engraving tool
Attachment 25346
that I am not sure what is the correct terminology in English.
https://youtu.be/HUJNKM5omm4
Attachment 25342 Attachment 25343
Attachment 25344 Attachment 25345
Attachment 25347