I want to cantilever a dock out over my pond. Have tried to search the internet for the way I want to do it and found nothing. Basically I want to install a concrete base in the ground on the shore with 2 3/4" masonry threaded rods 4' apart sticking up about 6". Take 2 3" or 4" black iron pipe 20' long and drill a hole about a foot from the end of the pipe slip it over the rod and fasten with washer and nut. Put my deck on top. The pipe might end up being 15' out over the water.
