Abstract: An apparatus which is enclosed within a main tool bar carried by a vehicle and is used to raise and lower an auxiliary tool bar or other implement carrier such as a row marker. The apparatus includes a frame having a first portion of a cross-sectional size comparable to the cross-section of the main tool bar and a second portion of a size to be removably mounted within the main tool bar. Such frame supports a fluid cylinder having a guided piston rod the outer end of which is connected to one end of a link and the opposite end of such link is pivotally connected to a tongue carried by the auxiliary tool bar, such auxiliary tool bar being pivotally connected to the first portion of the frame which is mounted on the main tool bar.