Am building a WM World Star 40 and the steering arm and the wheel collars have a metric set screw that I can't find an Allen wrench to fit. Have a Hobbico metric Allen wrenchset but the 1.5 is too small and the 2.0 is too large. Can't find a hobby shop or tool store in Las Vegas that has anything in between. Built a WM T-34 that seems to have the same hardware, but they must have included the correct Allen wrench with the kit since I don't remember having any problem. Have searched my workshop from top to bottom but I can't find an odd wrench anywhere. Does anyone know what I need and where to get one? Airborne doesn't answer their phone or return my calls as promised by their answering machine.

Mike H.