Cylindrical lockset knob to lever conversion assembly

A field conversion means to convert a knob-handle lockset having a spindle coacting with a latch, initially installed in a door, to a lever-handle lockset, said means comprising a lever-handle, a rosette or escutcheon having an interior surface, a helical coiled spring having projecting nibs at each end thereof in said rosette or escutcheon, said spring being biased to oppose droop of said lever-handle from a normal horizontal position and to oppose downward operating force applied to said lever-handle, stop means comprising at least one termination of at least on partially circumferential slot in said interior surface of said rosette or escutcheon to limit the angular rotational travel of said lever handle, and a drive cartridge adapter cylinder to operatively connect said lever-handle to said spindle, a positive stop disk, said disk having at least one cam extending angled to the plane of said cam disk, said cam bearing against one of said nibs on said spring, the other of said nibs being positioned against a said stop disk to prevent circumferential movement thereof, the rotation of said disk moving said one of said nibs circumferentially relatively to said other of said nibs, whereby said spring is stressed and the force exerted by said spring is increased, said lever-handle including an inwardly extending sleeve, said sleeve having at least one longitudinal slot, and said positive stop disk including at least one drive tab in the plane of said disk, said drive tab configured and sized to fit into said slot in said sleeve, whereby rotation of said lever-handle rotates said disk, a compensating rose having an outwardly facing recess to provide clearance to said disk and said spring means in said rosette, said sleeve having an external fully circumferential slot near the inner end thereof, a split ring retainer, said retainer configured and sized to fit into said circumferential slot on said sleeve to retain said spring and said positive stop disk in assembled position, wherein there is an inside conversion means for the inside of said door and an outside conversion means for the outside of said door and a pair of said conversion means are provided, whereby both sides of said door may be converted, wherein each said rosette or escutcheon is provided with a pair of mounting studs, each of said studs sized and configured to receive a through bolt, wherein an inside drive cartridge adaptor is provided with an externally projecting tab to engage a longitudinal slot in said initially installed lockset spindle and an internally projecting tab at right angles to said external tab, wherein said field conversion means includes a plurality of said cylindrical drive adapter cylinders, each of said adapters having a different diameter, whereby said field conversion means can selectively accommodate a plurality of different cylindrical locks.