Hey Gunbie, My instructions where non head size, shape related. So even if you head is non-slanted but more as Schlitze, Zip, & Pip the Pinheads from Todd Brownings 1932 movie "Freaks" the headphones should still be nested on your ears. If your just a total Bonehead, then Staple/Nail/Glue Gun, & Duct Tape could be optional means of fastening?