Jaj, in the moment you create a spring, its length is determined. It will stay in that length. A trick that I used often before is to first create the model, then drag the dots to the desired points, and then delete the springs between them. You can then put in new springs, without moving the dots from their new position, and enter simulation mode. Most constructors also use grids (lines used for measuring lengths of springs, that forms a static lattice) or guidelines(lines used for measuring the length of springs, which is built separate for every model). This kind of help makes it possible to build all the complicated models in the zoo.
Happy sodaconstructing! /ax
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