ESU says 2.6 mm banana plugs fit the Track Out jacks on the Lokprogrammer. An online search found only 4.0 and 2.0 mm banana plugs. Wikipedia says miniature banana plug sizes are 2.0 mm and 2.6 mm with the 2.6 mm plug commonly used in "model railway" applications. I tried a 2.0 mm pin plug, commonly used for speaker connections, in the Lokprogrammer jack and found it was too small to make a secure connection. Does anyone know of a source for these 2.6 mm banana plugs?