Change Thinkpad CPU DIY:
1. Remove screws on the back for keyboard, wrist rest and touch pad.
2. Remove wrist rest and touch pad, remember to detach the cable under the touch pad.
3. Move away the keyboard, no need to detach if you are brave enough, just move it a bit, so that you can touch the thing under keyboard.
4. Remove the cover of wireless antenna.
5. Remove screws for CPU fan and move it a bit to see the CPU.
6. Turn the screws for CPU lock 180" to release the CPU.
7. Change it and undo the above steps.
I changed the CPU on T60 myself, now it changed from T2400 to T7600, speed boost and got 64bit mode enabled.
Forgotten to take pictures!
