I want to install a post for my radar. This post will have a retractable arm that will have a pulley system to help me lift and place my kicker on the dinghy. (after all I am getting older) I have seen a similar post installed on other 34's. I would like to put it on the port side of the stern rail. I envision it going through the deck and then bolted to the surface close to the rear water tank fill hole in the lazerette. My question is this. How close does the water tank come to that surface? Do I stand a chance of drilling into the tank if I secure this post? Is there someplace that I can view the tank and how it is installed? Any help would be appreciated before I do something that will require other fixes. Thanks.