A rotor for use in a gas turbine engine comprising: a rotor body, wherein said rotor body is configured to rotate about an axis of rotation and said rotor body extends circumferentially about said axis of rotation, and has an axial direction along said axis of rotation; a ledge comprising a holding structure for holding blades radially inwardly of said ledge; a plurality of blades comprising a mount structure positioned beneath said ledge, said blades having an airfoil configured to extend upwardly from a platform, and said mount structure configured to extend inwardly from said platform; a load slot in said ledge, wherein said load slot is sized to allow said mount structure of said blades to be moved radially inwardly of said ledge by positioning said mounting structure to move through said load slot, and said blades then be moved circumferentially to have said mount structure radially inwardly of said ledge; and a lock slot in said ledge on one circumferential side of said load slot, wherein said lock slot receives a lock, wherein said lock is also partially received within a portion of at least one of said blades; characterized by: a shield slot in said ledge on a second circumferential side of said load slot, wherein said shield slot is sized to be different from said lock slot such that the lock cannot be inadvertently positioned within said shield slot, wherein a circumferential distance from a circumferential edge of said load slot most adjacent said lock slot to an edge of said lock slot most adjacent said load slot is defined as a first distance (di), and a second distance (d 2) is defined from a circumferential edge of said load slot closest to said shield slot, to an edge of said shield slot most adjacent to said load slot, with said second distance (d 2) being less than said first distance (d 1). a rotor body, wherein said rotor body is configured to rotate about an axis of rotation and said rotor body extends circumferentially about said axis of rotation, and has an axial direction along said axis of rotation; a ledge comprising a holding structure for holding blades radially inwardly of said ledge; a plurality of blades comprising a mount structure positioned beneath said ledge, said blades having an airfoil configured to extend upwardly from a platform, and said mount structure configured to extend inwardly from said platform; a load slot in said ledge, wherein said load slot is sized to allow said mount structure of said blades to be moved radially inwardly of said ledge by positioning said mounting structure to move through said load slot, and said blades then be moved circumferentially to have said mount structure radially inwardly of said ledge; and a lock slot in said ledge on one circumferential side of said load slot, wherein said lock slot receives a lock, wherein said lock is also partially received within a portion of at least one of said blades; characterized by: a shield slot in said ledge on a second circumferential side of said load slot, wherein said shield slot is sized to be different from said lock slot such that the lock cannot be inadvertently positioned within said shield slot, wherein a circumferential distance from a circumferential edge of said load slot most adjacent said lock slot to an edge of said lock slot most adjacent said load slot is defined as a first distance (di), and a second distance (d 2) is defined from a circumferential edge of said load slot closest to said shield slot, to an edge of said shield slot most adjacent to said load slot, with said second distance (d 2) being less than said first distance (d 1). a shield slot in said ledge on a second circumferential side of said load slot, wherein said shield slot is sized to be different from said lock slot such that the lock cannot be inadvertently positioned within said shield slot, wherein a circumferential distance from a circumferential edge of said load slot most adjacent said lock slot to an edge of said lock slot most adjacent said load slot is defined as a first distance (di), and a second distance (d 2) is defined from a circumferential edge of said load slot closest to said shield slot, to an edge of said shield slot most adjacent to said load slot, with said second distance (d 2) being less than said first distance (d 1).