its suprising how a rotavator with good depth control/wheels and a smart operator can ride over stone, does shake it about bit tho and feel bad when yer doing it, kindof the opposite to how a power harrow pull himself into stone...if it was that stoney how do yer get on with a rotospike would it not be beating it's self to death
dont know much about a 'Dutzi' to know if they are a heavier duty version ofone or like them beasts of a machine they renovate tracks with?