Anyone else have a Raijin RDA clone?

It's a cool design but unfortunately the inner spinning drum is waaaay too loose.

Has anyone found a fix for this or have any ideas?

My camera is out of commission right now but this video shows what I'm talking about

raijin clone rda from fasttech review - YouTube

Any tips or tricks would be greatly appreciated! Thanks!

(P.S. I tried petroleum jelly between the two drums but it made a mess and it doesn't respond well to heat.)