This spin on the test plant revealed a few things that need work. The piston rods are a bit long: they shouldn't be poking through the ends of the extensions at forward dead center. (Keep your prurient thoughts to yourself.) There is still too much friction in the mechanism, and the gearbox runs hot after a few spins.
The test run is successful, because it detected those problems.
The sound feature on the camera is good enough that, when the machine is ready for its debut, I will have a tape of appropriate Soviet music playing. (There is such a record playing during this session, although it's not audible over the clatter of the motion.)