On Wed, 9 Jul 1997 PanWong@aol.com wrote:

I think it'll have to be body and mind. Just like with the techniques,
except, most probably, Akane would only be able to access the Deminsional
Hammer only in Ranma's female disguise.

Later in the manga, Ranma hammers people several times as a guy.

(It's at about the point where Takahashi staretd running out of ideas, too.)