condenser coil.

[mississippi]

hey guys, first time poster and builder. just finished my condenser coil for an offset head plan.my forearms are killin me. Pretty tough but once you get the technique down its still damn hard, lol. it is a double helix style coil just like a strand of dna. i hope it works. for my inner coil i used 1/4 inch copper with a spring style bender and wrapped it around a broomstick, worked pretty well, for the outter coil i used a 2 '' peice of pipe to wrap around. It ends up fitting into a 3 x 12 '' copper pipe after some cussing and adjusting. just a tip for noobs like me my first attempt failed, i figured 20' of copper 1/4 '' would be plenty, turns out 35' of 1/4 copper is more like it so i came up short about 3/4 the way thru it . so i had to buy a 50' roll cuz they dont sell 35' rolls. This made my double coil just at 12'' x 2.8'' in diameter. Has anyone had good results from bob lennons design for a valved offset reflux still?
thanks