the idea of using light metals with multiple perforated holes to construct the housing, resulting in a lighter reel that also allowed the spooled fly line to dry more quickly than a conventional, solid-sided design. Early fly reels placed the crank handle on the right side of the reel. Most had no drag mechanism, but were fitted with a click/pawl mechanism intended to keep the reel from overrunning when line was pulled from the spool. To slow a fish, the angler simply applied hand pressure to the rim of the revolving spool (known as "palming the rim"). Later, these click/pawl mechanisms were modified to provide a limited adjustable drag of sorts. Although adequate for smaller fish, these did not possess a wide adjustment range or the power to slow larger fish. At one time, multiplier fly reels were widely available. These reels had a geared line retrieve of 2:1 or 3:1 that allowed faster retrieval of the fly line. However, their additional weight, complexity and expense did not justify the advantage of faster line retrieval in the eyes of many anglers. As a result, today they are rarely used, and have largely been replaced by large-arbor designs with large diameter spools for faster line retrieval. Automatic fly reels use a coiled spring mechanism that pulls the line into the reel with the flick of a lever. Automatic reels tend to be heavy for their size, and have limited line capacity. Automatic fly reels peaked in popularity during the 1960s, and since that time they have been outsold many times over by manual fly reels. Modern fly reels typically have more sophisticated disc-type drag systems made of composite materials that feature increased adjustment range, consistency, and resistance to high temperatures from drag friction. Most of these fly reels also feature large-arbor spools designed to reduce line memory, maintain consistent drag and assist the quick retrieval of slack line in the event a hooked fish makes a sudden run towards the angler. Most modern fly reels are ambidextrous, allowing the angler to place the crank handle of the reel on either the right or the left side as desired. Saltwater fly reels are designed specifically for use in an ocean environment. Saltwater fly reels are normally large-arbor designs, having a much larger diameter spool than most freshwater fly reels. These large arbor reels provide an improved retrieve ratio and considerably more line