I use allan head screws with a fiber washer. I tape the cowl into position and drill all holes 1/16". I then remove cowl and drill out the fuse the same size as the inner yellow rod used in the nyrod kits. Rough up the outer surface of the nyrod with some 80 grit sandpaper. cut to 3/4" lengths as many as you need. Use some slow setting epoxy and install them flush into the holes you made into the fuse.
This way the screws have something to bite into and they never back out. Works great on all my gassers.
ttyl