PenderMillsap
Spaceman
I can't disclose yet how they work because I have not yet built them but in theory they should both work. One requires perfect manufacturing to be perpetual and to function correctly; the other three require parts difficult to obtain (the other three are almost identical to each other aside from how they move). I designed the former perpetual motion machine on an encyclopedia example of a flawed perpetual motion machine - I corrected its error - the encyclopedia did not correctly explain why its flawed perpetual motion machine would not work.