When changing a doorknob, it's important to understand that their are two parts to a doorknob, including the handles and the latching mechanisms. Insert a striker assembly before applying the two handles of a new doorknob with help from a certified home inspector in this free video on doorknobs.
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Hi my name is Mark Blocker and in this segment we're going to cover how to change a door knob. O'kay how to change a door knob. It doesn't make a difference whether it is a lever style handle assembly or a standard door knob assembly there is basically two portions to the door knob, the handles themselves and the latching mechanisms. To remove the handles most of them will be on the inside of the door, have all the fastening hardware and this is going to be held together by two screws and you can see the angle there. If those two screws aren't visible they are there on every doorknob assembly. Sometimes what you have to do is remove the handle itself and by removing the handle this is a spring or a turn lock device that can be twisted and removed and that will access you the points to obtain the two screws. I found a longer Phillips screwdriver works a little bit better for door knobs because it gives you a better angle of approach rather than a shorter screwdriver. But basically what you want to do is remove those two screws and that will allow your handles to slide off. Once your handles have been removed you can remove the striker assembly that is mounted on the end of the door and it is held in by two screws as well. Just remember when installing the new one insert the striker assembly first before applying the two handles. That is how you change a door knob.