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compuwife (Apr 26, 2001 01:58 a.m.):
Lapping is sanding the heatsink and sometimes the cpu...although you need to be very careful with the cpu...
Get yourself some 600-800 grit sandpaper, and some 1000 grit to finish it off with...also, do it on a piece of glass or mirror for an even sanding job.
When I did my hs & celly, I used wet sandpaper...
Fix the sandpaper (start with the grittier of the paper) to the glass, wet it, then sand your hs in a figure 8 motion occasionally do an up & down and side to side motion...with even pressure...when you have evened the surface out polish it off with the 1000 grit ensuring that there aren't any scratches or dimples anywhere on the heatsink.
read the front page..they have in depth articles on the subject I'm sure