the anti vibration kit is a pair of small plates bolted to the lower housing and connected to the engine with a spring
very easy to spot as it is installed on each side of the engine PH near the rear.
your engine does seems to vivbrate that much and the video posted view angle does not permit to confirm a kit is installed.
the problem with bad vibs is that the engine shakes so much it pull the choke button rearwards and kills the engine.
you do not seem to have that problem .
the pin remains a mystery for now….
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