The helicopter deal is familiar!, I have a couple bits like that. Dull ferrous bits for everything including aluminum (with some cutting oil or wd40 etc.) and a makita electric grinder full speed all the time-I just lighten the pressure I am putting down on some spots. It takes some time to get used to running an electric wide open and not screw up **** lol (especially controlling the chatter) but for me it's faster and has a better port finish and just works.