Or maybe a specially rounded lip, curving just slightly up around the crown, in additon to the long tapered point, would dispurse the evil rays more effectively. Leprechaun, the perfect design came to me in a flash: Instead of a 'rounded lip', purse it! If, in addition, you keep your own lips in a pursed state, its effectiveness is almost guaranteed. (If you stay in a whistling frame of mind, it won't be difficult to train yourself in this matter.) Other than this improvement, I think your own design is excellent, and I'm sure it has been working. Alumin(i)um foil is a wonderfully effective choice- not only is it unfailingly malleable, but evil things bounce right off, given a little assistance with the proper design.