1. A 1/8th inch allen wrench should be used.
2. Factory installed spotlights use Custom Fit shafts, the park position is not adjustable. The car companies require this so that the light goes in the same way every time to limit operator error on installation. The set park position is also determined by the car companies and the location where the light comes through the vehicle. As far as instructions go for adjusting park position, all I have is the version in the spotlight installation instructions.