I'm new at all of this, so please bear with me. I was looking online at a 5-pack of replacement coils and it looks like these are the ones I might want: Kanger Protank 1 & 2 and EVOD Coil Replacement 5 Pack - 2.5ohm But, I can't figure out how to remove a coil and replace it. There appears to be a slot for a screwdriver at one end, but turning it seems to do nothing towards removal. Do you just press it out somehow, or what? Thanks for any help.