Metal detector manuals generally come with mechanical diagrams. Garrett and Minelab offer mechanical diagrams with their products; however, Kellyco does not offer mechanical diagrams of its metal detectors as of 2015.
Sometimes mechanical diagrams are available from the manufacturer's website. Garrett.com offers diagrams for products such as the ACE350 metal detector and the AT Gold metal detector. In addition, Minelab.com offers diagrams for its metal detectors, including the X-Terra 705 model and SDC 2300 model. KellycoDetectors.com does not provide users with mechanical diagrams of its metal detectors, which include the MP3 Pro model. In most cases, the company only provides a simple picture for assembling the major components.