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Sanded all the sides of the landing brake straight and profiled the curved corners in a pleasing manner.

Marked a 1/8" margin around the brake and tried to sand to the profile with folded 40g and with a sanding block without notable success. Made a profile sander from a small bit of 1/4" ply with rounded edges of a smaller radius than the corners of the brake with a thin strip of 60g stapled on. It was pretty awkward to grip, but better with a couple of 17mm finger holes drilled through. I considered a handle, but I wanted to be able to invert it. This tool does the job nicely with good control, but each strip only lasts a couple of minutes sanding. This will also work well when I'm finishing the window rebate sanding.

Have not decided what to do at the leading edge, there is no lip there except for squooged micro, but maybe it doesn't need one.

In the meantime, taped up the fuselage bottom so I can fill in the low spots on the brake, and fitted a taped ply dam at the leading edge of the hinge, to keep micro out of the hinge, and let me de-raggedize the current glass edge.

Added taped dams to the surrounds of the main landing gear cover and the cover, aiming to increase the depth of the NACA between station 6 & 7, from just aft of the cover to about 3" forward of it. Duct needs to be shallower forward of the 4th station

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