I think it just needs to sit in the slot to stop the disk rotating. When you screw it to the tank the star washer sits against the tank to provide the sealing pressure. You need to make sure it doesn't come out of the slot as you tightening the screws. Just snug up the screws and check the lever moves and gets tighter as you tighten the screws. Mine worked fine but was very firm to move until I sprayed it with acf50. Nice and smooth now.
Hope this helps
|