The trap is formed on a stiff cardboard paper core with 1 1/4 inch outside diameter. On this I drilled holes for winding the tank coil, 110 turns of #30 awg enameled wire. Both Poole and Osterhoudt recommend #32, but 30 is what I had. Over this I would a coupling coil, 15 turns space wound of #22 awg enameled wire. Tuning of the tank is completed with a 410 pF var cap.
Tuning is sharp and deep, it takes a bit of getting used to, but then, schezzam!!!.. problem station gone! I luv it.