I must agree with Ford.
The aesthetics of wabi - sabi both acknowledge change and the effects of change. They are basically a melancholic response to impermanence and the beauty inherent in something that is less than perfect due to the effects of mere existence over a period of time. Essentially therefore, an artifact such as a tsuba cannot be created with an eye to this aesthetic since change upon a finished piece can only be inflicted by time, use etc. These aesthetics are not in any true sense of the term, creatable by the hand of man.
The above is not however to say that an artisan cannot invoke the 'spirit' of the aesthetic in a piece, he simply cannot create the real thing from his own hand, only an illusion of it. Only time can render a piece truly wabi or sabi.