Hi Don, I came up with this idea for making coils. For a bending form I taped “list” (I hope my English is correct; it’s the foam strip used for stopping draught) around a little plastic funnel. You can easily make HHG coils like this, or Cesco’s big secret coils perhaps. For SBB coils I taped list in a jar lid. I thought I’d share this idea, for everyone can buy these materials at their local store. My regards, Carolien