Microcoil and cotton works wonderfully for me.
Cotton sized so that it snugly fits into the slots in the well. Cotton protruding out of the well cut just shy of the edge of the atty. As the chimney screws down (without the o-ring) it mildly compresses the protruding cotton which draws it towards the well.
Wicks brilliantly, vapes like a good'un. So well in fact I doubt I'll try any other kind of set-up. I've replaced the cotton four times now after dry burning the coil, each time met with success.
When I get a minute I'll do a photo of the build if that helps.