W160xD55xH90mm, China

Anyone know what is function of this tool?  Advice needed!
A small gift will be sent to the person with a convincing answer.

What I have been thinking so far;

  • the bottom curve is similar to that of a rolling machine (e.g. fire cracker roller)
  • a rod can be fixed through the circular hole with a wooden pin then attached through the top opening
  • the pin will be limited the rolling extend of the rod

My idea has came from the fire cracker roller machine where the bottom curve acted as a roller producing hollow paper tubes for the fire cracker.