And of the following solutions could ruin the connection, but might also fix problem.
Can you drill and tap threads for larger hole? And then use larger diameter screw?
Try screwing in a fine thread bolt so the thread doesn't match and then that might tighten.
Tap a fine thread into same hole and then leave tap shavings there when screwing in fine thread bolt... or screw in regular bolt after tapping fine thread.
Try sticking awl into hole and bending down to mis-shape the hole slightly so thread might take hold.
High heat from the connection prevents other methods such as adding glue or other material.
Loose screw and wire can cause arcing and high heat leading to fire... keep all wire connections covered so fire cannot get oxygen and spread
Fire safety on following link:
http://waterheatertimer.org/Troubleshoot-household-electricity.html
Gene
Water Heater Timers Save Money If you need further help, I’m available over the phone at
https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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