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Weld Tool

A constraint-based weld tool would probably be nicer to use, but this has the perk of literally combining the welded bodies.

A welding tool for Teardown!

Click on one object to start a weld, then click on another to finish it.
Switching away from the tool will cancel the current weld.
Can function strangely when joints are involved.

Do what you will with this, although credit where one thinks is needed would be appreciated.