Do a search on this site for Kayfyn V4. There are threads with many posts addressing this issue and possible fixes. Most common is to replacing o rings.
I have a Kayfun v4 Infinite clone. Mine leaked out of the air holes when I didn't use enough cotton. All the instructional videos said less is better, but I guess I took it a bit too far. Maybe try using a little bit more cotton.
It really isn't that complicated, once you play with it a bit. Doing a complete teardown requires paying attention so you don't lose something, but day to day isn't a problem
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