You want to totally remove the wiper drive spline? That requires motor removal.
Why not just remove the arm itself. Reinstall the retaining nut onto the spline so that you will know where it is.

Coat the spline with a little grease or anti-seize to prevent corrosion in case you want to reinstall it at a later date.
Why not just remove the arm itself. Reinstall the retaining nut onto the spline so that you will know where it is.
Coat the spline with a little grease or anti-seize to prevent corrosion in case you want to reinstall it at a later date.