extension 47 and therefore urges the tips of the crop contact rods 45 into the overlying vine foliage the cross arms or cordons 11 and 14 provide a ceiling for the free ends of the crop contact rods 45 so that the contact tips will remain within the foliage to thereby shake the fruit therefrom since the rotation indicated by arrow 42 of the oscillation generating head induced by the motor 39 would proceed unchecked if allowed the rotation is stopped by contact with the shock absorber 34 fig5 a any convenient means could be used to provide a stop for the aided rotation in the direction of arrow 42 it may be seen in fig5 b that the tips of the contact rods 45 may be raised or lowered by adjustment of the variable length arms 26 and 27 wherein such head height adjustment is in the region of plus or minus 10 inches in a preferred embodiment it should also be noted that the tips of the contact rods 45 are varied in height by contact with a ceiling provided by the cordons as the rods are urged into the ceiling through an angle of about 40 50 u00b0 while.