Take a large headed metal wood. Mill out the sweet spot in a circle. At the bottom of the hole, put a pin, a holder for a .32 blank, then an anvil mounted on a replacement surface plug. Add a restraint system.
When the club head hits the ball, the surface depresses until the .32 hits the firing pin. The force of the blank is transferred to the ball, in addition to the club energy.
Also, a 1.68" cohorn mortar, a Parrot or Swivel gun, a linear accelerator with a iron-cored ball, a 2.75" rocket with a small payload, exotic club shaft materials.
What can't a tinkerer do to a golf club? (Except make it into a coffee maker or toaster.)
