Originally Posted by Bun-Bun
By sanding the bottom do you mean the area the glue touches? or the die touches?
The area the glue touches should be easy, and I plan to do this tonight. But what about where the die touches? How can I get in there and be flat?
Ya don't. At that point buy the CNC machined replacement copper IHS from RockIt. I think it's ~$20. I got mine for the 7900X for $13 during a sale.