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Primary spacing, again

Hi all,

I'm in the process of constructing a 4" coil a la John Freau. I'm thinking
about using around 30 turns of 0.125 copper tubing for the pancake primary.
The power supply is a hot-rodded 15kV/ 30mA, (now 42mA), NST. What I'm
wondering is what turn to turn spacing should I use? At first I planned on
0.250", but it seems to me that with so many turns the turn to turn voltage
wouldn't be that great and I could probably get by with a smaller spacing.
But how much smaller I don't know.

Comments and suggestions welcome,