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A simple solution is to try and put your counterweights offbalance a little and it probably will stop the oscillating. I had that happen a few times and that fixed it.
But it is a symptom of too much slack. A bit of backlash and these mounts don't really suffer from backlash. So perhaps redo the cam lock pin as per the Chris Venter video. Perhaps a slight adjust of those 2 threaded bolts. But remember where you started.
From memory winding them out loosens, winding them in tightens. But remember your starting point and do the same adjust to both ie. 1/4 turn inwards (clockwise) on both. I would check if there is any slight rock in your RA axis first (wriggling it).
Greg.
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