OK here we go - the wire I’m using is actually 28 guage plain Kanthal.
My mandrel is marked, 1.5, 20.0, 2.5. 3.0 and 3.5. I’ll use either 2.5 or 3 depending on the mood I’m in, how much room there is on the deck, how far apart the posts are, and ( in Scotland in the Winter) how much available light there is.
I nominally aim for 1.6 Ohms but I’m pretty relaxed about it, as for me, anywhere between 1.2 to 1.8 Ohms is fine for MTL Vaping. YMMV.
I personally don’t like spaced coils as I find them the very Devil to wick.
When I first started making coils, back in the day, kit wasn’t so readily available and I/we’d use drill bits, nails, small screwdrivers, even one of our wife’s knitting pins or crochet hooks to wind round. I started off using 10 turns, fitting the coil, taking a reading and worked from there.
As for wicking, a lot of people, including me then, bought a big bag of cotton balls from the nearest Supermarket, unrolled them and cut them to size with the kitchen scissors.
I leave the coil legs quite long, but fold overhangs well apart and never touching anything metal while I burn the coil in, to check that it is glowing evenly and that it doesn’t have hot legs before giving it a final squeeze with ceramic tweezers before wicking, then I cut off the overhangs.
CAVEAT - if you are using a mod to check the Ohms and to burn in the coil and don’t have ceramic tweezers so are using metal ones double check that the mod is switched off - the results can be spectacular to dangerous if you accidentally touch the firing button as I can attest!
Nowadays for ease I use Pro Vape cotton to wick as it is precut to standard uniform width which makes life easy.
Apologies for the long post, especially if you already know most of this.