Took the skins off again & adjusted more rib flanges. I manufactured, alodined & painted a tapered spacer to fill the gap at the main spar splice as I had done on the lower surface then took the plunge & installed the pitot/AoA probe using 316 grade stainless steel 3mm bolts. I'm going to need to be EXTREMELY carefull not to damage the probe from now on. The reason I chose to install the probe now was to enable a leak check of the plumbing & rectification of said leaks if required prior to skinning. We are experiencing large changes in barometric pressure at the moment so I've placed an old altimeter set to the nearest thousand feet next to the water manometer in order to give me some idea if a reduction in pressure is a leak or baro change.