im looking for a 18 mm grinding bit for my drill to drill out the 11/16 front bushings i got from summit to fit the 18mm sway. the closest grinding bit i found was 11/16 which is 17.5mm should i buy that and barely grind it out winging it. or dont drill out and have a very tight fit if they will fit. or is there such thing as a 18mm bit. chike drilled out his in his how to.