6 it will be seen that as part of the coupler 50 arrangement the inner end 14 of the crank arm 12 includes a pair of bosses 52 and 54 each defining a through bore 56 a third through bore 58 is defined in the crank arm 12 adjacent the clutch housing 32 the coupler 50 includes a collar 60 that carries three connecting pins 62 each of which is held fixedly in a respective hole in the collar 60 and extends slidably within respective one of the bores 56 and 58 as indicated by the arrow 66 the collar 60 is moveable in an axial direction parallel with the axis of rotation 38 defined by the clutch assembly 34 between the coupled position shown in fig1 and 5 and an unlocked position shown in fig6 the connecting pins 62 and the bores 56 and 58 are all parallel with the axis of rotation 38 and each other and thus when the collar 60 is moved axially it performs as a pin carrier and the connecting pins 62 slide within but remain engaged in the bores 56 and 58 keeping the collar 60 from rotating with respect to the inner end 14 of the crank assembly 10 it may be.