Maybe they send all the unthreaded capped dremels to New Zealand I don't know. But this is how I change the brushes in my Dremel 4000. Usually its a 2minute job when you just unscrew the caps. But when you can't do that, it is a slightly bigger job.

Chapters

0:00 Intro
0:23 What worn Brushes sounds like
0:51 Changing the Brushes on unthreaded caps
3:33 Recommended Step for smooth running
4:00 Sneek peak inside the dremel, why they wear out


Can anyone let me know if they have come across non-threaded caps in dremels in the comments