The plastic that Verlane uses is LDPE. Which stands for either, "low density poly ethelene" or "low density poly eurathane" can't remember which just at the moment. Verlane kindly gave me a sample of it. It works realy great! Just place it over a drawing (mirror imaged) of your patern and then engrave the lines with an oscillating engraver (not a rotary engraver). These engravers are less than $20 at hardware store. Scourcing the plastic can be a bit tricky. It is used by the people who make prosthetics. So find a medical supply company. I've been told that you can also heat it with a hair dryer and then shape/mould it around the swell of a saddle fork for transfering tooling paterns onto swell covers. Have not actualy tried that yet, but given time I will.
regards
DAM