If you ever plan to lap your CPU you HAVE TO know about this Tool! - YouTube
Results from lapping my cpu : r/pcmasterrace
Tech ARP - The CPU & Heatsink Lapping Guide
Die Lapping For Better CPU Performance | Hackaday
CPU lapping | TechPowerUp Forums
First time ever lapping a CPU and it's a 10900k. Not as bad as I thought!!!!! Keep that nice even center little pressure and be sure to rotate. Glass is usually true