A key (13) is fitted into the coupling keyway (14) and the rotatable shaft keyway (15).

A rotatable shaft keyway (15) is formed in the rotatable shaft (12).

A key (13) is fitted into the coupling keyway (14) and the rotatable shaft keyway (15).

A rotatable shaft keyway (15) is formed in the rotatable shaft (12).

The thrust collar is attached to the carrier by inserting the pin into the first pin hole in the thrust collar and the second pin hole in the carrier.

The second sliding wedge transmission (100) comprises a driving wedge (101) that can be moved between a support element (85) and the following wedge(71) in the wedging direction (4).

An axle housing (54a) is secured to the axle plate (12a).

A cooperating sleeve (11 ) within the heel is provided with a keyway profiled to fit over a key (14) on the end of a pin (12) when the keyway and key are aligned.

The wafer assemblies include a base wafer and a re-settable wafer that may be adjustably coupled to the base wafer.

According to the invention, the key is equipped with an end part (C2), known as the key foot, and a key head (C5) which are provided on either side of a body (C1).

A key (10) insertable into both the first and second keyways.

The keyslot is rotationally spaced apart from the at least one keyway relative to the longitudinal axis.

The flexible spline has teeth partially meshing with teeth on the circular spline.

At least 70% by number of the fine particles have a major-axis length and minor-axis length which satisfy the relationship (major-axis length)/(minor-axis length)≤1.5.

Preferably, the key case has a releaseable lock for locking the key unit in its first position within the key cavity.