Mark a dimple in the center of the body cap with the center punch tool. {“smallUrl”:“https://www. wikihow. com/images/thumb/2/2f/Make-a-Pinhole-Lens-for-Your-SLR-Camera-Step-1Bullet1. jpg/v4-460px-Make-a-Pinhole-Lens-for-Your-SLR-Camera-Step-1Bullet1. jpg”,“bigUrl”:"/images/thumb/2/2f/Make-a-Pinhole-Lens-for-Your-SLR-Camera-Step-1Bullet1. jpg/aid1076217-v4-728px-Make-a-Pinhole-Lens-for-Your-SLR-Camera-Step-1Bullet1. jpg",“smallWidth”:460,“smallHeight”:306,“bigWidth”:728,“bigHeight”:485,“licensing”:"<div class="mw-parser-output">License: <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://creativecommons. org/licenses/by-nc-sa/3. 0/">Creative Commons</a>
\n</p><br />\n</p></div>"} Using a nail or similar tool is also effective. {“smallUrl”:“https://www. wikihow. com/images/thumb/e/ee/Make-a-Pinhole-Lens-for-Your-SLR-Camera-Step-1Bullet2. jpg/v4-460px-Make-a-Pinhole-Lens-for-Your-SLR-Camera-Step-1Bullet2. jpg”,“bigUrl”:"/images/thumb/e/ee/Make-a-Pinhole-Lens-for-Your-SLR-Camera-Step-1Bullet2. jpg/aid1076217-v4-728px-Make-a-Pinhole-Lens-for-Your-SLR-Camera-Step-1Bullet2. jpg",“smallWidth”:460,“smallHeight”:306,“bigWidth”:728,“bigHeight”:485,“licensing”:"<div class="mw-parser-output">License: <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://creativecommons. org/licenses/by-nc-sa/3. 0/">Creative Commons</a>
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Use something under the body cap to protect your working surface if needed....