The prop guards are a great addition to Solo, but they do flex in flight. I had a few minor prop strikes in medium winds, this was visible on landing by prop strike marks on the guards, on inspection the prop guard with the marks only had 1 - 2 mm clearance, and the other had 5 - 6 mm clearance. I got a replacement set from Polar Pro, now all guards have 5 - 6 mm clearance and no problem since.
