Quote Originally Posted by Martinm210 View Post
I never noticed where there was some sort of travel distance limitation,.... Of coarse I don't lap my processors very much, only enough to remove the coating and level the surface over the core, so it's probably a very small thickness.
travel limitation: there is; you may not have observed it, but it's there all the same. I wouldn't mention it here otherwise A washer doesn't fix the problem. A free travel mount does. I verified it.
very small thickness: we all thought the same thing (that it shouldn't affect the contact patch that is), myself included, prior to verify it by testing, but it does. Obviously how much it affects the contact patch depends on how much you lap the IHS; but it doesn't take much I can vouch for that. I lapped my 920 no more than 5 minutes (hand pressure) on the lapping machine, and it made a huge difference in the contact patch (I lost good contact with stock mounting). I didn't measure exactly how much I removed, but from 10 years experience with my lapping machine I can tell you that I removed between 0.003 and no more than 0.005" (<0.12mm)