as carpenters use a dedicated mortising jig which makes precise cutting of the pocket a simple operation, but the subsequent installation of the external trim can still prove problematic if the installer is inexperienced. Although the installation of a mortise lock actually weakens the structure of the typical timber door, the embedded lock is typically stronger and more versatile than the newer bored cylindrical lock format, both in external trim, and functionality. Whereas the newer mechanism lacks the physical volume and mechanical stability required for ornate and solid-cast knobs and levers, the mortise lock can accommodate a heavier return spring and a more substantial internal mechanism. Mortise locks are available in a wide range of functional security configurations, and are widely installed in industrial, commercial, and institutional environments. Furthermore, a typical mortise lock typically accepts a wide range of other standardized manufacturers' cylinders and accessories, allowing architectural and functional conformity with other lock hardware already on site. Manufacturers of mortise locks in the United States include Accurate, Arrow, Baldwin, Best, Corbin Russwin, Emtek Products, Inc, Falcon, Penn, Schlage, Sargent, and Yale. Distributors such as Nostalgic Warehouse carry a wide range of decorative trim and accessories to dress up the appearance of a lock installation. Also, many European manufacturers whose products had previously been restricted to "designer" installations have recently gained wider acceptance and use. Notes References Peter Brett. Carpentry and Joinery Nelson Thornes, 2004. External links http://www.lockwiki.com/index.php/Main_Page Locks (security device) Door furniture