12.3
Another thing to think about is how you release your hands from the lump of clay. Ideally, you want to release them very gently, as if you release your hands too abruptly, you'll notice a very slight wobble in the lump of clay, and if you do this just before you make the hole to form the base, the pot could become slightly off-centered even when you thought you centered it perfectly. Placing your hands onto the lump of clay isn't so important as you can immediately center them and hold them still, but when you release your hands you want to do it very gently, just to detach any connection they might have, and with enough practice, it just looks like you're removing your hands normally.