put a 1/4" bolt in the front and the 3/8" bolt behind the foldy. Or you can put the 3/8" behind and a 5/6" in the front hole by taking a 5/6 drill bit and just run it through the holes in the headtube that you stick the bolt in till it fits.angeLO. said:HOW CAN I MAKE MY HEAD TUBE ANGLE 90DEG