I decided to put a fretless neck on one of my signature guitar bodies equipped with a Sustainiac -- creating a fretless version of my Reverend Guitars RG-SUS electric guitar. To do this, Peter Fisher, the luthier/owner of Collar City Guitars, put maple in the fret slots of a Reverend neck. I haven’t had a fretless with a sustainer since I sold my Fernandes in 2004.