The narrow piece looks like it could be a pretty good place to mount a proper scraper that is fit to the rotating assembly. I wouldn't expect a mass produced pan like this to have a proper fit on the scraper, especially with the tolerances a sheet metal shop is working to. If I recall correctly, you want the scraper to be as close as .040" or so to the rotating parts? Probably better than not having anything but I think I would go through the effort of making something to fit.