 There is no radial clearance because two arms of the stepped wheel are always in contact with the double cam.Generally, combined contacts may be used to avoid the jerk (and wear and noise) associated with a single follower (e.g., a single follower gliding along a slot and changing its contact point from one side of the slot to the other can be avoided by using two followers sliding along the same slot, one side each).An elastically deformable mass deforms under an applied force (or acceleration); the deformation is a function of its stiffness and the magnitude of force.