I was recently commissioned by Brother International to produce a set of paper projects for their website. I'm delighted to say that they are now available to download for free! There are six models in total section divided into easy, medium and hard.
The crab model is one of the hard models. Don't worry it's not so hard and it is definitely worth the effort! Turning the handle drives a scotch yoke that will be regulars to this site. The scotch yoke in turn drives the crab claws raising the arms and clicking the claws together.
Everyone can download the crab model for free here of the Brother Int. website.