Set up a 7 wrap 3/32 28g for a 1.3 ohm coil in the rebuilt Grand. Vapor nearly instantaneous, and firing like a new mod.
That kit included the center firing pin, 510 gaskets, gold plated + contact, high temp fire button, gold plated - spring, bottle and tube.
The old 510 gasket was the PIA. I don't know if it was from use, juice or maybe overheating or over tightening, but it came out in pieces. slowly. I took over half an hour just getting the old one out, cleaning the inside of the 510 connector, and trying to get the new one seated properly. But it really is am upgrade for my old Classic Grand (Dusty ?) and well worth it.