I am currently winding a 6 Inch Minimum, Ruhmkorff Coil. I have a core 18"x1-1/2" I.D. I will wind 17 " of number 12, 2 layers, 250 Turns total. I will have the ability to run with the 250 turns, or 175, in parallel. The outside diameter of the insulated primary will be 2-1/2", so my...