Model Turntable Electrical Supply

I worked pottered on the electrical supply of the model railway turntable, and after some abortive attempts now there are two rededicated file fasteners serving as wipers (only one in the picture, for better illustration). Naturally a constant electrical connection is required at any angle of the turntable. Elaborated manufactured models would be available, but I regarded it as a challenge to arrange the details with my own means.