I started rebuilding a couple of years ago - PT2 heads.... Same philosophy. What resistance are you targeting? If you're going to build over an ohm, you could "probably" get away with using your mod to check your build, but you should consider a dedicated ohmmeter. Plus, it can give you somewhat of a platform on which to build without juggling everything....
Leave the mandrel in place while setting the coil - less likely to deform the coil until the insulator and contact pin have been reset. I use a wisp of a cotton ball to wick.
Wire can be had inexpensively from LightningVapes (if you're in the US). I like 28 or 30g in the CLR heads. I've also done a couple with 28g SS316 wire. Much lower resistance than Kanthal.
Steam-engine.org is your friend. There's a calculator in there to help you dial in on a particular build. Make sure to figure in leg length (I use about 20-30mm as an approximation on my +1Ω builds.) If I'm wrapping 30g kanthal around a 1/16" drill bit (just shy of the 1.5mm mandrel) About 7 wraps lands about 1.5Ω for me.
Vape on!
