Bending heater - Heater holder parts

[I have purchased a bending heater from Tap Plastics and I am in process of building the holder that is described from Tap for using the heater strip.

Everything is pretty simple I think, but was wondering what people are using for an insulation paper between the foil and the strip. Is there a place to get this locally...?

Some ideas of a different heater unit would be nice also....]
 
[Post pictures of it when you are done. I'd love to see it.]
 
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