Depending on the type of.
New door handles stiff.
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He may not have made the hole big enough or in the right place for the lever bar through the door which is the most likely cause of stuck handles if not take them off and grease the inside spring.
Spray the lubricant onto the stem of the latch bolt.
To rectify both handles will need to be.
Spray the stem usually located on the side that faces into a room with a spray lubricant.
Step 3 if the door handles themselves appear to be in.
If the door binds along the latch side the hinges may need to be set deeper or the strike plate may need to be set deeper.
Pull both sides of the door knob away from the door.
When shopping for types of door locks and handles also consider the lock s grade and ease of installation.
Remove the handle and try easing the mechanism with a spray lubricant.
Most pre hung doors whether equipped with a solid or split door jamb have the mounting holes for the door hardware already drilled.
Most lock manufactures have their products tested by the american national standards institute ansi and builders hardware manufacturers association bhma for grading on how their locks perform.
Step 2 now that the door handles have been removed from the door check on the rear of the plates for any obstructions.
When a slab.
If there is binding along the top or the bottom the door needs to be planed or trimmed.
Once eased off wipe everything down and grease the mechanism before replacing to avoid any future problems.
If the hinge side binds one or both hinges may need to be shimmed out.
I d say it s either the handle shaft hole is too small or more likely the handles have been fitted out of true not at 90 degrees to door face.
How to install handles strikes on new doors.
A new design feature is the 70 mm rose plate that easily covers paint rings left from previous door hardware installations.