. "Other objects and the means by which they are accomplished will be apparent from the detailed description of a preferred embodiment as shown ;.n the drawing, in which: Figure 1 is a section taken on a radius of a dental clutch construction embodying the invention; Fi ure 2 is a section taken on a radius of the sa'mconstruction at a different circumferential ocation it 3 is a section taken on the l" . . . .