Mason helped buck rivets today. We turned the fuselage on its side for easier access which worked well. Finished most of the left side skin (F1473) but ran out of 4.5 rivets to do the aft bottom area where the side skin attaches to the F1479 bottom skin. Similar to the right side, we upsized by .5 a few rivets where there were mulitple layers of skins. On order from Spruce.