In October 1951, the band recorded "Earl's Breakdown" which featured a technique where Scruggs would manually de-tune certain strings of the banjo during a song using a cam device he had made to attach to the instrument, giving the surprise effect of a downward string bend. He and his brother Horace had experimented with it when they were growing up. Scruggs had drilled some holes in the peghead of his banjo to install the device and chipped the pearl inlay. He covered the holes with a piece of metal, which can be seen on the album cover of "Foggy Mountain Jamboree". The technique became popular and led to improvement of the design (without drilling holes) by Bill Keith who then manufactured Scruggs-Keith Tuners. The original tuners Scruggs made and used are now in a museum display at the Earl Scruggs Center in Shelby, North Carolina.