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There is not enough information for me to say what the problem is. My guess is you are applying the transformation at the wrong hierarchy in the scene. node.getChildren will not return anything unless you previously called node.getChild or parented a node to the object. So it's not clear to me exactly which node you are operating on.
Click on the screw you want to translate in Inspector, then post a screenshot of the node path bar at the top, showing the full hierarchy of the screw. This should provide me with enough information to post some sample code for you.
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