Scota4570.

Fokker, so info from the Netherlands.
The tailskid wasn’t controlled by the rudder. The centre position was maintained by rubber bands that also were used for suspension, connected with the top of the skid in the fuselage.
The skate is made of steel to keep track on grass surfaces, very important part of the skid!!!!!
This is my copy of the original tailskid of the DVIII, scale ¼, I think the DVII would not be much different

What to do on asphalt or concrete? I don't know, you need something to keep the track!!!!

Cees