Panel Joinery 13

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This latch has the same locking effect but it is much harder to release.
So we're halfway through the article now. I'll put this one to bed for a week or so before progressing with the other half. I'll have a quick round up post tomorrow and release the files to go alongside these cuts. (I expect I'll have a big session updating all the files for previous posts so if you want anything in particular now is the time to ask)
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