SeaStar JP1000 Series Manual Jack Plate Side Locked The SeaStar JP1000 Series Manual Jack Plate is a durable jack plate option capable of handling the most demanding outboard engines. This jack plate features interlocking slide guides that offer enhanced strength while providing smooth, bind-free travel. The lead screw assembly sets the plate height and the side locks are used to hold the position. Additionally, the stainless steel lead screw is corrosion resistant and pre-greased for smooth ope