How do you tighten the LCA shaft?

View attachment 1715827150 So, totally rebuilt front suspension, set the ride height, torqued strut, now trying to torque the LCA shaft- no luck.

As soon as the lock washer engages, the entire shaft turns - with wheels on the ground or suspended on lift.
No place to grip it, so there must be a trick to it.

Attached is a photo of an old shaft - no place to grip it. Totally frustrating.
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