To install an Emtek key-in-lever/knob keyed entry set (such as the Luzern Left Hand Lever with Regular Rose), follow these standard manufacturer steps for a tubular door prep. 1. Prepare the Door and Strike Plate • Backset check: Verify your door has a standard 2-3/8" or 2-7/4" (2-3/4") backset and a 2-1/8" bore hole. • Install the latch: Insert the adjustable latch mechanism into the edge bore hole. Orient the curved face of the latch nose so it hits the strike plate properly when the door closes. Secure it with the two provided #8 x 3/4" wood screws. • Install the strike plate: Mount the strike plate on the door jamb using the provided #8 x 3/4" wood screws. 2. Disassemble the Interior Trim • Remove the inside lever/knob: Use the provided hex (Allen) wrench to loosen the set screw at the base of the inside lever. Pull the lever off the spindle. • Remove the rosette: Unthread the inside rosette (counterclockwise) from its housing. (If it uses a locking ring or spanner wrench design, use the spanner wrench to unthread the locking ring first). 3. Install the Exterior and Interior Chassis • Install exterior trim: Insert the outside lever/trim assembly through the 2-1/8" door bore hole, sliding the spindle and tailpiece through the latch mechanism. • Install inside chassis: Mount the inner housing onto the surface of the interior side of the door, orienting any notch or alignment marks to the bottom (with the two mounting screw holes typically positioned at the top and bottom). • Fasten chassis: Secure the interior chassis to the door using the provided machine screws (e.g., #8-32 x 1-1/2" pan head screws). Ensure the spindle and internal mechanism are aligned and horizontal. 4. Install the Rosette and Lever • Thread the rosette: Thread the inside rosette clockwise onto the housing or secure it with the locking ring using the spanner wrench. Check that it sits snug and straight against the door face. • Reattach the lever: Slide the interior lever back onto the spindle. • Tighten set screw: Firmly tighten the set screw at the base of the lever using the provided Allen wrench. • Test operation: Turn the key from the outside and rotate both levers to ensure the latch retracts smoothly without binding. Here is a video demonstrating the general installation process for an Emtek key-in-lever/knob set: https://www.youtube.com/watch?v=oON6F68d0Dw&t=54