The ball nut 124, {HEAD ~ tubular support} 126 and {TAIL ~ wheel support} 128 extend and retract linearly with respect to motor/alternator 24 in response to normal suspension system movements 
The ball nut 124 , { HEAD ~ tubular support } 126 and { TAIL ~ wheel support } 128 extend and retract linearly with respect to motor / alternator 24 in response to normal suspension system movements
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