wiper 3 speed convert to wiper 2 speed for MSD

long title i know.

so whats it take?

why?: my msd arcs to my 3 speed and i neeeeeeeeeed clearance! got any other ideas that will fix this and retain my MSD please let me know. i have stuffed plastic between them (not pretty) and it works but come on now. i need a permanent fix that is done right.