[dap930]

You can not remove the plastic collars without removing the steering wheel. Once removed there will be two more screws plus two screws that hold the horn contact strip. When all that is removed the wiper stalk can be removed by removing two mounting screws. You can check the "park" contacts in the switch by pushing the stalk arm towards the front of the car. If the wipers park, then the "park" contact that is "made" when the stalk is in the off position needs slight tweak. My wipers were intermittently parking particularly after using the washers when I discovered if I pushed the stalk forward the wipers would park. I cleaned the contacts with contact cleaner, but the contact needed a slight tweak to close the contacts properly. You can adjust the contact leaf with a jewelers screw driver, just don't over do it.