About 1.5 hours before lunch riveting the RH spar, in the area of the countersunk rivets at the most inboard end of the spar. About 45 minutes after lunch doing the reworks to the LH spar rivets - drilling out and re-setting about a dozen rivets. Another 45 minutes or so figuring out how to reinstall the root rib attach angles. Got 3 of the 6 bolts in place on these. Had them marked upside down and backwards, and after some confusion, I just looked at the plans sheet and compared to the shape of the parts, ignoring the markings. Don't know how I marked these so wrongly. Anyway, at some point I had them in the correct orientation/location for drilling, then marked them so I wouldn't forget how they went, and got that all wrong.
