Hadrian is moving from a press-fit door knob design to a design that utilizes a #10-24 tamper-proof style fastener. The new design provides better performance and easier installation. To install, simply align the two pins of the knobs and then engage the fastener. Easy.
The modification also gives the installer greater flexibility when tightening the two parts together, allowing for a more precise fit.
The new knobs feature a thumb-turn lever for both standard and barrier-free units.