S20x2 to M16 pull stud in drawbar, not in each holder

Hi Guys!

Just a quick question:
I have a 1967 Deckel Fp2.
For this machine I would like to use Sk40 tool holders. I know there's a stud for this. S20x2:M16 which seems to be commonly used.
But why is everyone buying loads of these studs for each holder? Can't you just use 1 stud in your drawbar, perhaps use some 638 locktite to keep it in place?

Thanks a lot in advance!
Best regards from Holland.
Remy