https://motorbicycling.com/threads/radius-washer-for-crankshaft.62247/
Above is the post I made along with that Briggs Video I saw online, I don't think it applies to the engines I have. The pictures, one is the video snap shot of the crankshaft on the engine that has that bevel edge. The second picture is my engine which does not have a beveled edge immediately at the point the crankshaft ends the surface a clutch can be on.
https://motorbicycling.com/attachments/cam24224-jpg.84278/
https://motorbicycling.com/attachments/cam24225-jpg.84279/
I can see no way it makes sense to use a special washer except on a crankshaft which has the bevel edge as in the video.
The terminology that you use, I am not familiar with, but I think you mean getting rid of any end play.
What I got are washers that have the inside clearance that just fit over the crankshaft and use them in one or more places on the crankshaft to get the clutch to not move laterally. To save on expense of washers if I have a lot of extra space and am getting the clutch to line up with chain or belt, I resort to a spacer and a few washers.
Then I put a fender or large flat washer over the end of the crankshaft along with a split lock washer and key in place. The bolt holds it together. If the spacer washers leave too much past the end of the crankshaft tightening down the bolt may put excessive pressure on the clutch and the crankshaft.
The pictures of my crankshaft and jackshafts after I had modified the bike to use a larger less worn Briggs, show here I used the tapped end crankshaft with bolt etc.
The jackshafts I had once had then ends tapped also, but I resorted to using split collars that do not mar the shaft. The other type of collars that the set screw messes with the shaft (they don't use key) I saved only to use with the set screw removed and then they become spaces.
Bracket parts still welded in place were from prior when I used belt clutch and required a back idler pulley to tension belt. When I restore the older engine it can be a spare and I saved the idler pulley parts and belt clutch and associated pulleys.
https://motorbicycling.com/attachments/cam24611-jpg.84366/
https://motorbicycling.com/attachments/cam25404-jpg.84495/