I ordered a chip from Jody at DP Tuner last week and got it installed last night. Installation went pretty smooth, but I have a question about mounting the knob. What size allen wrench do I need for the set screw in the knob? Of all the allen wrenches I have, I don't have the one I need. The wrenches I have are all a little bigger, so it looks like I'm going to have to go buy a set.