Well folks thank you for your firm comments.
I was really thinking that by threading the body on the braid - which really requires some force in the end - that I had a solid metallic connection.
I have never experienced any problems until now, and indeed I was forced to cut an old plug in the mast
and the good quality new coax was already in place so soldering up the mast was the only solution.
I'll guess redoing it with a crimping plug will be the way to go, have to look into it, I have never used them and don't know which equipment
Whatever, I have no problem to go and do "strange" things in the mast top even soldering but heating
up the body of a PL259 with a 100+Wat iron and in a stable way is a bit challenging
Yo convinced me to review my latest method (I did solder the braid to body in the past but often with trouble) and will redo all my "down to earth" plugs to practice.
The method with the 100Watt iron with filed tip and a vise seems the way to go.