Some of the models are not exactly in line with each other in regaurds to the point of origin for rotation and alignment. Epic fail by the creator :P There are two tick boxes in the bottom right of the Spark Editor, Untick the one on the left of the two to disable grid snapping, then you can move things with more persision.
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There are two tick boxes in the bottom right of the Spark Editor, Untick the one on the left of the two to disable grid snapping, then you can move things with more persision.