Interior door handles come in a number of different models and styles. The most common types that you will find on the interior of houses are the dummy, passage, privacy and bathroom handle models. These differ in the use of a latchbolt and whether or not they can be secured. No matter which type of handle you choose, fitting a handle to an internal door involves the same basic steps.
Insert the latch bolt into the side of the door, if this is a passage, privacy or bathroom door. The latch bolt keeps the door shut and requires that the user rotate the handle in order to open the door. Secure the latch bolt in the door with the two included Phillips screws. This step is not required on dummy handles, as these have no latch bolt.
Insert the exterior chassis into the opening in the door. The two sockets for the screws will fit through the two holes in the latch bolt assembly. Hold this in place with one hand while attaching the interior chassis. Insert the screws into the interior chassis and tighten loosely so that the chassis assembly stays in place in the door.
Insert the handle shaft through the chassis. Slip the alignment bushings over the shaft on both the interior and exterior sides. Slide the bushings into place so that they hold the shaft in the centre of the chassis. Tighten the chassis screws securely. Remove and throw away the bushings.
Slip the roses over the shaft and chassis on each side. Press down firmly against the chassis to secure.
Attach the handles to the end of the shafts. Tighten with the handle screw.
Be sure to follow the specific instructions for your door handle type.