A slight modification to laisch's Quicky angle grinder tool to fit the 28mm (center to center) nut on my Makita XAG04 18V angle grinder. Once printed, I tapped the threads for 8-32 by 1.25" hex head screws. The screw hole diameter is loose enough that you should be able to tap for M5 screws as well or possibly even just run either screw in without pre-tapping, but I have not tested that.