Antique Knob Retrofit Kit to Fit Modern Pre-Drilled Doors. If you have the Antique Knobs, Tubular Latch and Spindle this is your Retrofit kit. (Polished Brass) A very affordable to install Antique Knobs (or reproductions) in modern drilled doors Wood Adapters to be able to install the antique original backplates, knobs and latch in modern pre-d 2-1/2 Rosettes with matching screws, Two handmade Wood Adapters, to Retrofit Modern Pre-dri