OConnor Rosette Adapter (p/n C1249-1000). The OConnor rosette adaptor is for connecting a accessories to Oconnor platform rosettes.  The rosette adaptor can be attached to any of the platform rosettes on any OConnor head to provide mounting points for a range of accessories such as monitors, handles & lens drive controls. It includes 3/8-16 thread, ¼-20 threads and a 60 tooth rosette for attaching accessories from a number of leading accessory brands. Giving closer access from your free hand when operating.