This was a rough experiment to solve my -9 knot speed error, it started out with glueing a rivet head over the ports, this gave a +6 knot error, I started filing an edge and in the end thought about some Cessna and other certified ports that had a fence around the front.
I glued on a piece of Aluminium TIG welding wire (Aluminum for you guys who speak funny :D) in the shape of an arc, went and flew it, error sub 2 knots :)
Then I wondered should I do something more "professional" and risk the errors again or leave it how it is.............550 hours later.......... yep she is still there! :o
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