In a rod supporting portion {HEAD ~ 10e} formed integrally on the upper surface of front bearing support plate 10A, a spring biased latching ball is disposed which projects into one of annular latching grooves 123N, 123F and 123R in the outer surface of {TAIL ~ shifter rod} 120 for latching the rod at one of neutral and operative conditions of the change mechanism 6 
In a rod supporting portion { HEAD ~ 10e } formed integrally on the upper surface of front bearing support plate 10A , a spring biased latching ball is disposed which projects into one of annular latching grooves 123N , 123F and 123R in the outer surface of { TAIL ~ shifter rod } 120 for latching the rod at one of neutral and operative conditions of the change mechanism 6
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