Ofcourse, you need tools (that's a no-brainer) ... a dremel would be a good start .... but definitely not a task to be undertaken by feeble minded at DIY. But like I said, not that hard (does not mean it is easy!)

Having worked at my family's machine shop, programming CNC mills/lathes and Wire EDM's for a few years, if you can do what you're saying with a dremel and have it actually work, I'm sure we ALL would love to see that.

Indeed. Pekatete is clearly so much better than us that I'd love for him to teach us how to manufacture high grade heatpipes from scratch. Because its easy, you know.
What on earth has it to do with you (dogie and bitchie) if it costs more or is hard to fabricate? This is a case of nit-picking gone mad. The initial post was somebody wondering whether a copper heatsink would work better, and I actually concur with them as copper is a better heat conductor than aluminium, but of course (EVERYBODY KNOWS THIS!) more expensive.
And for a person who claims to have worked in a family machine shop, apparently programming CNC mills and wire EDM's, this has to be a walk in the park! But hey, there have also been claims of people being millionaires at 13 and I would not be surprised if the two (pathological liars) are the same person.