Sam and Alex, brothers from Aussie, came for 2 days and we got started on laying the 2 inside walls. 4 rows on 1, then 4 rows on the other. We found out after all this time we had been making two different sized bricks. Our bricks were from a 300mm mould and had generally shrunk to 297mm. The others were from our friend's 310mm shrunk to 305 or so. So, having realised this and sorted the remaining bricks by size we got remarkably straight walls.
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