I Installed the temporary Skybolt quarter turn fasteners on the upper cowling. HINTS: I ran into a slow down as the cowling gets very thick from the middle to one end which made the installation very difficult. Each hole had to be ground down in the thick areas to allow the temporary O ring to be installed. This O ring keeps the fastener body installed until the permanent metal ring is put in place after painting. I managed to get some of the magnetically centered holes drilled and clecoed. I didn't have all the magnets I needed so I did what I could and the others will have to come later. Also, the engine is so close to the flanges in some areas, those holes will have to be enlarged with a small sanding disc and not the step drill. By the way, the color coded tape is to keep me from putting a drill thru a valve cover or cowl baffle. To make life easier, I also marked where I didn't have any centering magnets.