I apologizes for replying in English, but i don't speak German. Do you want to know how to take rotor speed ? You watch for zero below a vertical deflector and count 321 321 321 and watch number below deflector ( or use a thumper ) ... Very acc ... One other thing you might want to explore is that the wheel does not have 36 degree of freedom. That means that you can get one speed hit 6 to 8 STD or hit 40 to 50 times during one full evening at the table. Other benefits with one optimal speed is predictable ball jumps. One time some one ask Laurance how to take rotor speed with very fast rotor. Then Laruance reply that he sometimes took rotor timing twice. Cheers