Step 5: Final
Since you are making a SPDP (actually SPCO according to wikipedia, since it has a "all off" position) switch, you need to put it together and see where you need to drill holes for the contacts. Stack the disks and ring with the ring and washer as the middle layer (bolded for those who do not understand). Put the #10-32 screw through the center and tighten it. Now you can rotate it and see where you should drill your holes for the contact screws (this might actually take some CAD work if you want ultimate precision).
Drill the holes with the drill bit, and screw in the #8-32 machine screws. Tighten everything with a nut, connect some wires to the three screws, and secure each wire with another nut.
To assemble it, stack it in this order
washer (inside the ring)
tighten with screws
You can drill more holes so you can choose the angle later
Test it with a multimeter
You are done, now you can connect the wires to a R/C car controller