Here it what I do, this blocks the drain of the ceramic but I see no problem with that.I have the FT (non logo) one
Which is brass my RH Herc is plated so i sanded it down.
A few clone owners report there centre pin moves off centre, not been an issue here, when you have it apart maybe check the 510 post is true.
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I cut off the end of a pipette, slit it and remove just a bit more so id is smaller.
It does the job of centering well as that is quite important.