The last time I was regularly working on the airplane, I made a few mistakes -- and today I fixed one of them. I had mistakenly riveted the angle pieces that attach the smoke oil tank to the rear baggage floor. They are actually supposed to be detachable using four 1/4-20 wing-nut bolts. Otherwise, you'd be carrying the angles around all the time, even when the smoke oil tank is removed to maximize your baggage space. Today, I drilled the rivets out and removed the angles, re-riveted the four floating nutplates to the floorboard, them filled the extra holes in the attach angles with SuperFil. After some sanding and an eventual coat of paint, nobody will be the wiser. I also did quite a lot of organizing and cleaning in the workshop.