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The gap you need depends on the ply thickness plus paint, it’s unlikely to shrink/grow a lot, just measure and leave a mm or so. It doesn’t need to be close as that joint has a huge moment arm, the bit that resists is the top/bottom corner of the slot on the opposing face rotating about a pivot 300mm or so below it? It’s a hugely strong joint that you can have apart in seconds. Usefully both parts are the same so make one and template the others

[QUOTE="TheTiddles, post: 1716413, member: 3754"] The gap you need depends on the ply thickness plus paint, it’s unlikely to shrink/grow a lot, just measure and leave a mm or so. It doesn’t need to be close as that joint has a huge moment arm, the bit that resists is the top/bottom corner of the slot on the opposing face rotating about a pivot 300mm or so below it? It’s a hugely strong joint that you can have apart in seconds. Usefully both parts are the same so make one and template the others [/QUOTE]

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