well all i did was form it in its compressed state.it was not too big a toroid.since my coil is small,would it be better to refund the ducting and get 2 small metal mixing bowls?what would give better results?the coil is only 270va but i have two of the same transformer so paralleling is possible but i would like to avoid all the safty gap trouble.i also have a 15kv30ma one and a 12kv 30ma on the way.any tips? matt