Quote Originally Posted by auminer View Post
There's 2 different kinds.



Top one in this pic looks for all the world like it's solid Al, but it's way too heavy. Ratt bastard file reveals a copper core in the bottom part, with Al fins.

Bottom one is in maybe 10-15% of these units, and looks to be ~15 or 20 cents worth of Cu in a block at the bottom, then a couple of Cu 'pipes'. ... Unless I could get that block out in about 2 seconds and not a high risk of slicing off a finger, I'm not really interested in fighting with it.
On the bottom one, I generally put them in a vice. Then take a chisel (wood chisel works very well) and hit it once or twice. It'll pop right off. More like 30 seconds most likely. About the same amount of time would be spent shaving the fins off of the top one.