Have fun making those slinky's. Maybe they will all do that. I have put a soldering iron on glue joints using an 1/8th" plastic rod to get what I need. First you need a very tight dowel. Heat and melt the connections, pushing the material into the melted area and quickly mash the puddle with a blunt punch to cool it them rotate. Super glue will crack under stress. You got juked

It can be done but this process may seem like to much work the first time.
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