I have replaced my swingarm’s right side specialty nut with a nylock. Finding a 17mm socket will be much easier than a spline tool that is required to properly remove that fastener.
BTW the nut is a M10 1.0 pitch. How did I know that? Well I bought a thread checker. You can find it in the Gear I Use section under Other Stuff.
Lee Riddle’s Ghetto Spline Nut Tool – Hey he said it works for him so why not?!