1. As I said, it was not a "test case" it was an exploration of the boundaries of your definiton.
2. If you re-read the definitions you quoted you will see that the phrase "manual implement" appears redundant if, in your usage, a manual implement can include just hands.
Redundant how? An implement can be nonmanual - e.g., divine. Therefore, the adjective is obviously required, therefore it is not even remotely redundant.