Snake

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I'm trying to make the 3 or 4 segment snake, I made x and y for each part and told each part to accelerate to the next piece.
part one accelerate to part two's x and y, part two accelerate to part three's x and y, etc. this all works fine, my only problem is I want the segments to accelerate to the out side edge of the next part rather then the center of the actor.. does anyone have a quick fix/ideas on how to do this?

Thanks