The Threader is pre-loaded by pulling the Pull Wires and Vice Block against spring pressure and cocking.

The pile to be pitched is lifted until the bottom is about 1m (3ft) above ground level. The threader is then clamped onto the pile with the Vice. The relative position of the pile is governed by a Stop Plate to suit the pile section being used.

The pile with the threader attached is then lifted by the crane to the last pile in the panel. By means of the Rollers the lower part of the threader is then clamped to the last pile in the panel so that the interlocks are adjacent to each other. The clamping operation is designed to permit free movement of the pile and the threader in a vertical direction but prevent movement in any other direction. This attachment is normally done at top frame level.

The cocking device inside the Vice Slide Tubes are then released.

The crane lifts the pile to be pitched until its bottom edge is above the previous pile in the panel. The spring pressure on the Vice Block forces the pile across into the interlocking position. As the pile is lowered it interlocks. The threader is then unclamped at top frame level.