Because you (and me) can't get no longer current pickups for Playmobil generation 1 locomotives (i.e. current from the rails), I developed a new one. It does not win a beauty price, yet it is functioning.
This thing uses the original cage of the locomotive, you have to bore only one hole.
Resolution 0.1 mm only for the bolt.
In picture 2 you see examples with two different wires: copper and steel.
For the sequence of the wiring please see picture 3.
You can use 1,5 mm² or 1 mm² wires, except for the spring hole. For this hole use a 1,5mm² wire piece of ~18mm.
All holes in the bolt have a diameter of 1,5mm.
A 1,5 mm² wire has a diameter of approx. 1,382 mm.
A 0,75 mm² wire has a diameter of approx of 1 mm.