I'm slightly confused about the tutorial regarding the new shoulder gaskets. If I leave them as-is, just trimming the excess rubber, then they have the flaps on the edges as per the tutorial, and everything make sense. However, if I cut on the suggested lines, marked in red in the first image, then there is no longer any flat flaps of rubber with which to finish the seam. Wyatt, what is your recommended method for finishing these seams when trimming that deep?