One of the two drawers built into the nav table cabinet on my 35-3 is no longer able to remain shut if the boat heels. I've learned that the drawer slides used by Ericson are Delta Glide 100 and I've found a source for them. But I have a question before I order a replacement set. The Delta Industries site mentions an optional fitting called a Travel Loc that will keep the drawer shut while underway. I don't see any such fitting on my drawer and wonder if I need to purchase. Anyone who has replaced drawer slides have advice? Thanks.