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These are some models inspired by the feature model of the 40-Model set #8540. This model also appears in the manual of the 50-Model set #9550. In each case, the model's front legs are the ones driven by the 1.5" 3-flat Pulleys, as in the original Mammoth.

Click on the images to view an enlargement.

First variation, with rolling back feet.

Second variation, with dragging back feet and shorter legs. .

The instructions for the Mammoth from the manual of the 50-Model set.