Summary: it. We assumed we would need one without any testing. At the very least we needed a flat surface to mount the flat bottomed resistors and later a heating element. Here is the result: To make the heat spreader: Obtain a 2 disk of .093 aluminum to glue into the little depression in the bottom of the can to make the outside bottom nice and flat. We cut this from some
Image Dimensions: 414 x 381
Image originally found here.