The jointing systems vary depending on the manufacturer. Components, such as ledgers and transoms, are designed so that they can be interchangeable.Proprietary systems rely on ledgers and transoms having a locating lug. These ends can be quickly dropped into the clips, sockets or cups, which are fixed at regular intervals on the standards. The standards often come with spigot ends, which allow the next standard to be located over the locating spigot very quickly.
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