Hey bob01dog,
there are also butt connectors like this insulated for 0.5 – 1.0 mm² or for 1,5 – 2,5 mm² or this non-insulated for 0.5 – 1.0 mm² or this for 1.5 – 2.5 mm² (needed dies: 974910 or 974930 for non-insulated or 974906 for insulated connectors) that can be directly crimped on the wire ends. See here for details on tools needed. Here the same applies as said above: Crimp tool and crimp connector is required to match wire gauge!