At last the C yoke arrived from Isham tools courtesy of the COVID delay and I could not resist but get stuck into riveting up the back spar and a little of the front. One dodgy over set rivet in the back spar and the rest really nice and consistent with the squeezer.
Going to rivet up the front spar tomorrow and see just quite how big the horizontal stabiliser is...lucky I built some extra shelving in the garage!
