Revo 3.3 Tranny with all Metal Gears problem

I have just installed the RR all metal tranny gear setup and I want to lock into second with the new metal gear but the holes in it are bigger already than the stock plastic one, so the mod I see on here won't work, I need a bigger bolt etc ...can I grind bigger half moon in the clutch and use bigger bolts and thread the holes?..has anyone had this problem and resolved it? Here are few pics sorry my cam does not focus right sometimes..