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Step 7: The"body ball"

Glue in an M4 nut in the middle of the back of the "body ball". One of the battery magnets will later attach to it? on the outside.

As a last step before packaging as a kit, I add two sticky pads (foam tape, with the top cover layer kept on), where the arms are to be attached to each “body-ball”. As many types of glue do not stick well to the balls and neither does the double sided tape, I glued the pads in place with hot melt glue. An alternative is contact glue.

 
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