Just remove the nut from end of slipper and it will pull off in your hand. Its best to remove the tank and engine when replacing the pads.
Installaction: Add a small drop of ca glue to the pads when you install them on the slipper plate. Be sure the pin is in the input shaft when you install the slipper. Make sure the 2 washers between the spur bearing and the nut are oriented like this ( ) against each other other wise the slipper adjustment will loosen and probably throw another pad. Adjust to your preference, not too loose, not too tight.