Surely if the hardening has failed, it'll not wear the cam? The Cam will wear the shim (quite fast) I'm just curious here, not disagreeing in any way.Looks like the hardened surface is failing and is pitted l would change these otherwise it will wear the camshaft.
Don’t turn the shim, you’ll just put the disintegrating surface into contact with the bucket, get some new ones.I use selenia racing, bought this car 3 years ago drive around 3000km in a year and change the oil every year, the car has 170000 km-s pretty good history. Ok i will change or turn the shims and hope the cams are ok.
On the photo it looks like the cracking/breakup of the surface goes all the way to the edge of the shim.The shims only rest at the outer edge on the bucket, the worn surface will not touch anything.
But if hardening is the problem, follow the advise from Oneball.
Interesting to read this is a problem of insufficient hardening.