Mine arrived about 15 minutes ago and with a bit of trepidation I tried screwing it onto a SMPL clone (figuring if it got stuck it's a large piece to hold on to, and I won't hate mangling a $22 clone if necessary). Unsurprisingly it got stuck, but I forced it a bit and it's smoothed out the threads a little. Whilst it still has a slight sticking point, it threads properly onto each mod I've tried it with.
I'm assuming one of the small o rings is there to fit under the 510 isolator and allow the centre pin to actually protrude?
I'm assuming one of the small o rings is there to fit under the 510 isolator and allow the centre pin to actually protrude?