Some further thoughts on the BB4 and Uno:-
• First build of 7 wraps 28 gauge kanthal on a 2.5mm pin (1.2ohms ish), stuffed with more cotton than I thought necessary works great. Usually with rebuildables less is more, but you need enough to fill those giant wick holes. Next time I'll try a 3mm coil so it doesn't feel so tight (although to be fair, it works fine as is)
• If you screw down the top cap too much the DNA reads the coil as either 0.05ohms or switches to temperature mode, which is weird
• Ohman recommended screwing down the ring as tight as possible, he never has a gap. Turns out you need to screw it down ultra tight to make the connection anyway. The remaining gap is quite tiny.
• Ohman recommended that should you feel like you need to reduce the length/gap that you ought grind down the positive pin rather than the tube (why didn't I think of that?!) and that if you mess it up the pin and insulator can be nicked from an Ego One CLR. I don't see a need to any more.
• What a lovely bit of kit. I've been using a Moonraker nano (which I would not recommend) and it puts it to shame for half the price.
Hopefully this is of use to someone. Cheers.
HP