I'm a huge supporter of breaking your fingers to play bass faster/better.
1. Wash the hand to be broken well beforehand. Make sure to remove any nail polish before as well.
2. Selecting the right hammer is CRUCIAL. Simple one sided mallet type hammers will NOT work. Remember:
We're trying to break fingers here, not smash them flat
One like this is just what you want
3. Anesthesia! You can't do this fully conscious, but there's no "
Right" way to get the sedated effect needed for hand breaking.
JUST MAKE SURE TO MAINTAIN ENOUGH AWARENESS TO LIFT HAMMER. Alcohol has been my favorite way of getting nice and relaxed for the procedure, but non-drinkers can try Acetone vapors, glue, or if readily available, Ketamine
4. Place your hand flat on a somewhat rigid concrete/gravel surface. Level ground is good, but avoid a completely smooth surface. This will give your hands the "grooves" all the hot bass players have sculpted their hands for. Bring the
CLAW end of the hammer down straight into the center of the back of your hand. Immediately you will notice that your fingers have done something we call "unstretched". You will be able to play all of those neck running licks, fret those seemingly impossible harmonics, a new world of bass playing has opened!