engage the circumferential channel 32 in the center collar 31 the retainer pins 36 may be a friction fit within the openings 37 in the control ring 38 or may be secured therein by an appropriate semi permanent attachment means the retainer pins 36 thus positively engage the center collar 31 and allow an operator to position the center collar 31 to a forward or rearward position and control the direction of the output of the reversing mechanism 10 in a manner to be described subsequently referring now to fig5 and 6 a rotatable cage or inner collar 41 is illustrated at the end of inner collar 41 most proximate the housing 11 is a fourth set of teeth 42 which are selectably engagable with the clutch teeth 34 on the center collar 31 the clutch teeth 42 are oriented such that clockwise motion of the inner collar 41 relative to the center collar 31 is permitted whereas counterclockwise rotation is inhibited the inner collar 41 is coaxially positioned and rotatably mounted within the housing 13 by means of a needle bearing assembly 43 on the inner surface of the inner collar 41 is a set of gear teeth 44 which extends substantially the full length of the inner collar 41 the gear teeth 44 cooperate with the gears in an epicyclic gear assembly 50 which will be described below the housing 13 also includes a concentrically disposed thrust ring 45 disposed between the end of the inner collar 41 opposite the teeth 42 and the housing 13 the thrust ring 45 provides a bearing surface against which the inner collar 41 may bear as it rotates referring now to fig7 the epicyclic.