Sometimes its just fine to be lucky when what you'd really like to be is good. Take, for instance, the rear corner of the typical baffle seals on a typical Lycoming installation. You have a baffle seal that comes down the side, and another that comes across the back--and where they intercept, you need to make sue that they overlap in a friendly way to get a good seal on the cowling. Sometimes, they just don't want to be friendly when they are new, so I have always used a little persuasion – a flush #8 screw, Tinnerman washer, and nut on the back side. It holds the corner together nicely. Continue reading "Sure, I Planned That"