Kuhn Axis fertiliser spreaders — Rauch in Eire — were first offered from December 2005 in basic 30.1 D and electric variable-rate 30.1 Quantron E ‘QE’ versions. James de Havilland takes a look at the 30.1 D and 30.1 QE, along with the 40.1 W weigh cell spreaders, and outlines key developments/pointers to consider when picking a used buy