Old Man Mike, couldn't you at least punch random holes in those cannisters with some hole punchers? I bet the plastic is thin enough for one to penetrate. DFI sells heat sinks for our motors. I used to fly with them but quit to save on weight as light as they are. I also didn't think they made enough different to matter. There is a thread discussing how someone actually performed a test with and without sinks with a heat measurer and said that the sinks did reduce heat when used.