If the bolts aren't torqued correctly, the eccentrics will spin free and the control arm will swing from end to end in the slot. They don't need to be any tighter than the standard spec.

I agree with all the other replies. The shoulder thing is useful for dialing in the adjustment, but once you tighten the eccentric bolt/nut, it is the clamping force holding it in place.

But getting it adjusted in the first place can be difficult with those shoulders gone or partially damaged. Here is a thread where I took care of things on my car. Still holding perfectly well.

https://xoutpost.com/bmw-sav-forums/...djustment.html

I drilled and tapped a 6mm hole in mine and screwed in a real short bolt so the eccentric washer pushes against it for adjustment. Easy peasy.

Aha! That’s exactly the sort of simple solution I was incapable of thinking of! Nice one.:thumbup: