Tower Bridge with Opening Bascules - Working Worm-Gear Model

London's Tower Bridge as a 250 mm desktop model whose bascules really open. Turn the gold knob at the end of the river base and both road decks lift together, all the way to vertical (about 3.5 turns). A hidden worm-gear drive holds them at any angle. Everything is printed: no screws, springs, magnets or glue. HOW IT WORKS One shaft runs the length of the base inside a tunnel under the river Under each tower a worm on the shaft drives a gear sector keyed to the leaf's axle The worm drive is sel…

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