|Hello Steven, |
I have a 6mm diam galv wire attached to the aft of the centre plate that is 600mm aft along the plate from the pivot bolt. The plate is raised and lowered using a small 'brake'winch that is mounted vertically above where the wire exits the case. The wire is actually attached above the Centre of Gravity of the plate, so that it can be raised and lowered, in the horizontal plane, out of the bottom of the boat to work on it
In this position no water comes up the hole in the case. There is more load on the winch wire in this position; stainless wire does not take the sudden loads imposed by grounding and sudden take up of the keel weight. The wire loop/thimble shape is let into the back of the keel so that the 6mm stainless shackle goes into thicker cast iron. An access port has been let into the side of the centrecase to get to the shackle/keel joint when it is on the trailer; this is a plastic deck water filler fitting that has been shortened to suit. The system has worked well since I installed it in 1981.