Finally, a proper heatsink for the µBITX! I figured out a way to mount it independent of the back panel which will make it easier to work on.
But what an effort it was to get it all together. Getting the aluminum spacer drilled and tapped was the cause of much anguish, and till done it consumed 2 drill bits and two taps that are still embedded in the block. I also needed to unsolder and reposition one of the transistor for it to fit.