don't get cheated on comp heat sinks

I have see this come up now and then, and it was tried on me.

thgere are two different types of conputer heat sinks. there are the ones stamped out if plate or sheet alu, and ther are those that are extruded.
it is easy to tell the difference, but many yards are not particularly familiar with e waste, and will many times try to count the extruded ones as eith plain alu sheet or cast alu. don't let them do this. you may have to educate them, a little concerning e waste.