More information. Seems that the Aristo clone is a poor clone.
Several gears that are brass in the original are plastic in the Aristo.
There is also a spring to create some "give" when the motor moves farther than the switch points do.
This is necessary in all designs.
There have been reports that the Aristo clone's spring has bent/lost it's spring. One report was from a very avid Aristo supporter.
So, my advice is buy the real thing.