I used to move that heat sink to the appropriate spot if the processor was in a different location

Click to expand...

I agree,

Unfortunately, i had several issues with PAV / FBT and not so with logic boards, i resigned recently to throw 2 units i could not repair (i kept some parts anyway)

one of FBT was so bad that sparks were everywhere.

You can still use the Logic board and convert it to a sort of "hackimac" loosing the all in one aspect:

http://www.applefritter.com/node/858