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Place a cloth underneath the bat so the bottom does not get damaged. Use a table clamp to secure the bat so you can strike it easily with a mallet. Slowly test how much power you need to use so you don't damage your bat. Swing the mallet with enough power to leave an indentation in the middle of the hitting area. If it's difficult to see an indentation on the bat, loosen the clamp and hold it up to a light to see if you've made a dent. Repeatedly hit the entire flat area of the bat since a ball may be hit anywhere on the surface. Use the same amount of power you used to make your initial indentation across the face of the bat. The entire process should take about 6 hours. As you increase power, continue making the surface of the bat even so it is flat. Split your time knocking the wood into 10 or 15 10-minute sessions so you don't get burnt out. Test the wood with your fingernail occasionally. At first, your fingernail should leave an impression in the wood's surface, but after you've knocked it in, it will be harder to press. Ask a friend to toss gentle pitches to you with an old cricket ball so you can hit them back with the bat. This helps you detect if any sections of the bat hit unevenly. If they do hit unevenly, go back and strike the areas with a mallet again. Using a new ball could damage the bat if it is hit improperly. Alternatively, put the ball in a sock and tie it to a rope. Put the rope over a tree branch to make a swing. Hit the ball as it swings back and forth.
Clamp your bat down so the flat edge faces up. Hit the middle of the flat area so it dents. Strike the flat face of the bat until the surface is even. Repeat the process with harder hits until you've struck it 20,000 times. Practice hitting soft pitches with the bat.