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If you can't find a pre-made rack you like or you want do a project, try making your own. To make your own simple rack that will store 4 oars vertically, you will need to start with a piece of lumber that is at least 2 by 4 by 24 inches (5.1 × 10.2 × 61.0 cm). You will also need 32 inches (81 cm) of doweling that is at least .5 inches (1.3 cm) in diameter, wall anchors, and wood glue.  You'll also need a saw, a screwdriver, and a drill. Make sure you have a drill bit that is the same diameter as the doweling you are using, and a drill bit that is the same diameter as the shaft of the screws that will go into the wall anchors. If you did not buy a piece of wood that is exactly 2 by 4 by 24 inches (5.1 × 10.2 × 61.0 cm), cut it to that length. Then cut the doweling into 8 pieces that are each 4 inches (10 cm) long. You can use any type of wood saw to make these cuts. Even a hand saw will make quick work of these cuts. Mark where you will drill the 8 holes for dowels along the center of the wide side of the wood. Begin your marks 2 inches (5.1 cm) from the end. The 8 holes consist of four paired holes. The paired holes should be 2 inches (5.1 cm) away from each other, or the exact width of the neck of your oars. The pairs should be 4 inches (10 cm) away from each other. Then mark the 2 holes that will be used to anchor the rack onto the wall. The anchor holes should be 1 inch (2.5 cm) from each end of the rack. Once marked, center your drill bit on the marks and drill the holes. Drill the dowel holes halfway through the wood. They should not go all the way through the wood so that the dowels can be more easily glued into the holes. Drill the 2 holes for the anchors all the way through the wood, so that the anchors can be easily screwed through the rack. Remember to use different sized drill bits for the anchor holes and the dowel holes. Insert a pea-sized squirt of wood glue into each hole. Then insert a dowel into each hole, making sure it is inserted as far as possible. Be sure that the bottom of each dowel is touching the bottom of each hole.  If the dowels don't want to stay down, use a piece of painter's tape or masking tape to secure them down as they dry. If glue squirts out around the edge of the dowel, wipe it off with a slightly damp towel right away. It's a good idea to clean up the glue before it dries, as it is easier to remove. Let the dowels dry for 24 hours before proceeding with the project. Put the rack up on the wall and make sure it is level. Then mark where the anchors should go on the wall. After you have made marks, you can take the rack down and drill your pilot holes. Once the pilot holes are drilled, insert the anchors into the wall, line up the rack, and place the screws through the rack and into the anchors in the wall. Use anchors that are designed for your specific type of wall and ensure that the rack is fastened solidly into the wall. Once the rack is on the wall, you can hang up your oars. Simply hook the handle or head of each oar between a pair of dowels. It is a good idea to keep pairs of oars together when hung up, so that you grab matching pairs instead of 2 mismatched oars.
Purchase supplies. Cut the wood to length. Mark for the holes. Drill the holes. Attach the dowels. Hang the storage rack on the wall. Put up the oars.