Wellsir the ebay seller send me the wrong size set screws. I use the 2 allen wrench and the screws I got are way too small ... more like M1 than M2. I could not verify the size through the lousy instruction ... they just show it as a set screw with no size info. If the 2 wrench is what was used, then the set screw should be M2 correct? I tried contracting the manufacturer but so far no luck.