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In the Configurator dialog area, right-click the directory Parts to open the context menu.
Click Insert part... .
In the .../partsolutions/23d-libs/training/assembly directory, select the *.prj file of the butterfly screw.
Make your settings in the window Part properties.
--> In the Configurator dialog area you will see a further part butterfly screw (FS) along with the connection point defined in PARTdesigner.