The application of this type of mandrel is identical to the previously mentioned form mandrels with the exception that this type is not formed to a specific taper, but instead offers a polished and buffed surface upon which almost any taper may be worked (in conjunction with burnishing tools and lubrication, of course). Even in shops where form mandrels are readily available, this type of universal mandrel will see much use; a valuable dent removal tool.

At the time of this writing this specific type of dent removal device is only available through Ferree’s Band Instrument Tools and Supplies, Battle Creek, Michigan. It is an invaluable tool if used by an experienced technician in a repair shop that handles a sufficient number of large brasswinds (i.e. Euphoniums, Sousaphones, Tubas). The application of this device is based primarily upon leverage and eliminates the need of the cumbersome and outdated dent removal equipment once used for the larger brasswinds (usually requiring two persons!). An expensive, but invaluable tool in a large brasswind repair situation. For more information write to Ferree’s B.I.T.S., Box 259, Battle Creek, Michigan, 49016.

When selecting (or making) a set of tapered steel mandrels, choose a variety of out side diameters, tapers and lengths to suffice your anticipated requirements. Be sure to store them lubricated and in a safe place. Periodic checks for scratches or other blemishes may be necessary to keep them in top shape. When in use, the mandrel should correspond as nearly as possible to the straight taper being worked; using a small mandrel for a large taper is as bad as using too large a mandrel for a relatively small straight taper. (These problems will be outlined more specifically in later chapters).

The number and variety of threaded dent rods that a technician may wish to have will depend primarily upon the needs of his repair shop. This type of dent rod is designed to fit a broad range of curvatures and sizes of musical instrument bodies. The ends of the rods are threaded to accept a polished/buffed dent ball suiting the particular task at hand. Sets of compatible dent balls should be purchased along with the threaded dent rods. Below are some examples of the types available.