Wouldn't changing the driver's side arm also increase the passenger side wiper sweep as well? This is why I thought changing the pivot point on the driver's side pivot closer would be a better option.
I'll have to take some measurements and let you guys play with the numbers and such. You'll have to give me some time to get the measurements.
On paper however I've played with changing the pivot point and it does give me more swipe on the driver's side without changing the passenger.
