Replacement Coupling and Connecting Rods for the #7000 Lok7 Maffei locomotive are no longer available from Fleischmann or its service agents. I needed a set of these for myself and so designed this 3D print which contains complete sets of rods for 4 locomotives (or three, plus a spare set!).
These locomotives are old now and each one will have worn differently. Before fitting these new rods, check that their pins rotate freely in the wheel holes and that the open ends of the coupling rods swivel freely in the cross-heads. All three holes should be 1mm diameter, but might need a little easing with a 1mm drill bit.