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ETA: It worked! But dayamm! How ever did you think of it? I never woulda thought of something like that off my own back without having seen it first!

ETA2: Hmm, mine's slightly different; but I see how it's done in any case, and so how to adjust it.
Snaps!
ETA4: Not that I'm an obstinate four year old... but I just wanna try to see if I can duplicate that one

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Y
ETA6: