After replacing the missing nut with a new one from MB, I now have a "clunk" upon going over small bumps - manhole cover, driveway approaches - mainly with the wheels turned. Not noticing it as much when straight. So,

Did I not torque the bolt / nut down enough so ever so little play could cause this?

Do these bolts have a spot about an inch from the end that is NOT threaded, but smooth? This is the way my existing bolt looks.

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Francis E. Abate
Automotive Restoration & Preservation
Sheet metal, trim and upholstery