Tapered hub to stub axle washer?

[TurboFource]

Saw this reference on apexspeed.com ...." I'll scan a lock washer for you to look at. It isn't easy to visualize. The taper centers the hub on the shaft and should reduce or eliminate the "working" between the two. The concept makes sense to me and also worth considering as a Europa owner put me on to them and that group consider them to be the fix. "

Anyone know anything about this

[BDA]

I have them. I think I got them from Dave Bean. They are a thick washer with a “slot” cut through it allowing it to collapse to a smaller diameter as it get pushed into “counter sink” in the hub when the nut is tightened.

[TurboFource]

Thanks BDA....will look for them