I have a mini lava knock-off and it's a piece of junk!
First the bottom knob cap came off (no big deal, little glue); next I noticed the 510 threads are tapered.
Everything I put in this device only grabs the bottom threads as it drops in most of the way.
This is a big issue, as it tipped over and now the brass threads are stripped.
3 months in and it's worthless.