Engine shock absorber

[RodneyK]

I have two collars that fit on the crankshaft before the sprocket. One has a spiral groove around the circumference. Which one should I use? Is there a copper thrust washer that goes in there somewhere? Thanks as always. I rely on you all to get this done properly.

[dave16mct]

See your other post, no copper or any other thrust washers.
Dave.