Why not just rebuild the stock Nautilus coils? I have been rebuilding them for years. I think the world of rebuildables has gone whanky. The Zepherus, Atlantis, Melo. Cubis, kanger Sub tank series as a few examples are easier to rebuild the stock coils than it is for doing their rebuildable heads. Not a stock coil today I can't rebuild. Makes me shake my head why people want to wrap wire around tinny littles screws when stock coils you bend a wire and put in rubber grommet and stick a bottom pin in and clip two wires. I don't get it unless you want Clapton coils in then most times they wont fit anyways under the tiny screws. Please enlighten me as I am confused. CHEERS!