I see. You lapped the NB nicely, however you did not dare to go much deep... The question is like if one can go deep. I was told I can...
And I also believe that see the cooper inside mean to see the bottom cooper plate on witch from other side the chip is. Hence no harm should be done... But I wanted to get that confirmed and seems no-one dared...
I have a big Zalman on SB already glued with Arctic Silver epoxide. It is not going anywhere...
http://ax2.old-cans.com/s.php?p=badt...8&c=8&d=1&v=v2 