Just wondering if you make your own coils or prefer to use stock coils that have been built for certain tanks.

I used to make my own but now get my coils from FastTech.com.

although it is not to the same specs as I would like, it is close.

Mine used to be 2.5mm I.D (Inner Diameter) but the ones I get linked above are 3.5mm I.D.

So you have to be careful when dual coiling RTA's.