you have to take the staff off the base and tighten the spanner nuts on both sides of the pivot. Then reassemble. Takes a couple of tries to get it right but it does hold.

Thanks,the workmanship is on par with say C.sharps standard verniers in their "production" format, if I had to rate it-would be 8/8.5,with MVA being a 10 just because the clicks are kinda clunky on the micrometer
windage,and the staff detent,tho positive,is still somewhat rough.
But the metalwork and finish is almost as good,or as good as in some places,as Riflesmiths or MVA`s.The vernier markings are well done.
Definately better than any of the spaghetti sights.
Elevation is locked by the Hadley eyecup,though mine needs a little thicker washer between the cup and staf,its bottoming out before tightening up on the staff.

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"Clunks",not clicks, on every half turn about, the thread is maybe slightly out of round.
Real clicks on every line would be nice,like the Parsons mounts.