Shibarite 縛り手
"Binding hand": a plain Japanese term for the person who ties, without the honorific weight of nawashi or bakushi.
Shibari Study’s glossary lists shibarite as the person doing the tying, the rope top. Kinbakuwiki explains it as literally the binding hand and the counterpart of ukete, and stresses that it implies no special rank or skill. It describes the word as common in Japan both as a general label and as a way to describe oneself, whereas bakushi and nawashi tend to be honorifics used for others. The Kinbakuwiki entry is an unfinished draft without footnotes, so its nuance should be read as community usage.