To do the pencil trick you will first need to get a pencil, ie. a mechanical pencil, and then using the grphite draw over the level 1 Bridges. this will now enable your mobo to have full multiplyer capapbilities and you may then change the settings and the out come will be higher speed. You will also need to increase the voltage or the CPU wil become unstable or not even boost. And also remember when you overclock a CPU it will generate much mroe heat and you will need a good HSF to kep the temps running somewhere around the high 40C -> low 50C.
Hope this helped you out.
Albert.