A capo is a musical accessory used to raise the pitch of a stringed instrument, such as a Dobro brand resonator guitar, by pressing the strings against the neck, thereby shortening the length of the strings. Using a capo, musicians can play songs in different keys without changing the positioning of their fingers. Several different types of capos are sold made from different materials; their functionality mostly only varies in terms of ease of application. If you don't have a store-bought capo on hand, make a simple, temporary one on the fly using common household items. This capo will work for any guitar, whether it's a Dobro or not. A resonator guitar is essentially a guitar with a resonator -- a metal disk that resonates with the vibration of the strings -- instead of a sound hole.
Hold the pencil firmly in place over the fret you wish to capo on your Dobro guitar.
Fold a rubber band in half to make it shorter. Pull one side of the halved rubber band over one end of the pencil, then pull the loose end of the rubber band behind the neck of the guitar and over the other end of the pencil. If you do so correctly, the pencil should now be held firmly in place with the pressure of the tight rubber band.
Repeat this process with the second rubber band. This will ensure that the capo is held down tightly enough to the fret to achieve the desired effect.
Play guitar. If you wish to change the positioning of the capo, simply slide it up and down the neck and into place or remove it entirely and repeat the entire process on the new fret.