The extension cord makes a very solid impression. The cable is relatively thick and sits very securely to the plug and coupling. By built-in parental controls, there are when you plug in the clutch a little more resistance, but afterwards as well everything fits tightly and securely.
If you despite extension the original socket does not want to lose, but then I recommend a look at the Ritter Powersplit extension, which offers even more in a coupling connector for a few euros.
