Well spotted Andy RR
Its a patented device that looks remarkably like a Garmin GPS antenna.......but its not!
Its a cover for the cowl pins that would otherwise poke up in the air and move around, or be removed easily by folk with fiddly fingers!
I have just compared that video with others and it seems at takeoff power it does vibrate around a little. Cruise and less power its not moving at all.
Its just excited to see you!
