Peggy, I recently sent you an article about the changes I'm making in the head/holding tank on board. Wondering if you read it. The two questions I had are about the vent thru-hull location and how to install a new vent outlet on the holding tank in a new location which is not factory-threaded. I'm heading down to the boatyard this weekend and want to be armed and ready to do the dastardly deed of cutting new holes in the tank and hull. Would appreciate any advice. Thanks, Tom Ehmke