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Was that the scaling question? If so, it was 1:25 because it was 90:1600

Our teacher reckoned it was the easiest paper he had seen in a long time, I'm annoyed I got the bent nail question wrong, I had to get the out all the time on my project, too bad I couldn't find pincers and just kept using pliers instead...

To strengthen the joint (I think that was D?), it makes it less easy for the nail to get forced back out