There's no need to use a hammer, with Dubro's easy on/easy off spinners. Just press-fit the nylon lock nuts to the backplate, align the nose cone core to the backplate with the four included pins, and secure the nosecone with the included socket head screws. Fast, easy and effective. Each cone comes complete with the mounting hardware and four shaft adapters. * This is a STANDARD spinner NOT a Kwik-Lock spinner.