This motor was used in submersible screw pump. since it stopped working after 2 weeks, i started disassembling as sending back to china will be more expensive.
"not designed to be serviceable. They can only be taken apart forcefully by breaking stuff"
this worries me, as both the ends are covered by nylon disk, heating them will help in removing?
It looks like the nylon disc is a press-fit, and there are probably a few positions where the metal sleeve has been crimped / indented to secure the disc - such as the hole or indentation visible in your image.
You can probably force your way into it, but whether you can do much with what is inside is a different question.
