Screw Pack - What makes this puzzle much harder than it looks?

More OskarPuzzle at https://www.youtube.com/OskarPuzzle?s.... Print it yourself at https://oskarvandeventer.nl/Print-It-.... Buy at https://kubekings.com/rompecabezas-de... , https://www.puzzlemaster.ca/browse/3d... , https://i.materialise.com/en/shop/ite... or https://www.shapeways.com/product/JZ4.... Screw Pack is a packing problem. The object is to fit the seven screws flush into the big nut. The pieces have been designed in a misleading way, such that many packing fit partially, but then the last few screws don't fit. This makes it a confusing puzzle, even when the pieces are easy to distinguish by their color.

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