update on the stock heatsink:   400 degrees for a few minutes, with the parts elevated made them basically super easy to fall off. I lost no silver solder in the process so i'll reuse it when welding back with reverse process. the part with all the fins will slide out as well and with a little dremel action you could potentially slide in a bigger copper pipe and reapply silver solder and heat back up and it will stick. 
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