Thank you very much for your work - it looks very professional. Without skills in Freecad I had to convert step to stl and import into Fusion 360 to take out the cone of the cap - it was to big for my Sikaflex tube.
I wonder if you could give me a tip how to determine thread sizes. I can measure the tpi with a vernier but that of course may be not accurate enough and is onlympart of the info I wld need. I have had problems with for other Sikaflex sizes - How do you do this?