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Message: <blockquote data-quote="binky" data-source="post: 554179" data-attributes="member: 490"><p>Pilot bit is not needed once you have the hole started. Round here we have quite a few cob walls, so could hit slate or granite stones, or both. Most houses are also rendered - a by prouduct of the China clay indusrtry means lots of silver sand was available cheap, and rendering is popular becuase of the rainfall. So you start off hard render, then hit lumps of granite / slate and ancient mortar, then hard render again - right pain in the neck, and easier hit from both sides!  And just for fun, halfway through the wall a lump of granite falls down and jams the core..<img class="smilie smilie--emoji" loading="lazy" alt="🤬" title="🤬" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f92c.png" /></p></blockquote><p></p>