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What door knob are we talking about,, a door knob has screws on the back side, usually a #2 phillips head screwdriver will work in the screws.. If you are talking about a different knob.. please repiy on here... please mark as helpful..
Whole tap, there is a nut underneath that needs tightening. Don't over tighten it.
Just the knob or lever that you turn to turn on and off? You will find a small screw at the rear. It is a set screw, so it doesn't have a head, it just sits in a hole. Usually a hex key to tighten it. The hole is often filled with gunk so clean it first with an old toothbrush. The set screw is often sticky so undo it I turn before you tighten, lift the knob off, screw the screw in until you see it coming out of the inside to clean the threads. Unscrew the screw back out, replace the knob and tighten it.
Remove the knob by pushing in the small pin on the edge of the knob shaft. Then use a screwdriver in the small inset on the edge of the handle cover to pop the cover off. Tighten the 2 screws under the cover, replace parts.
On the inside side of the door knob, there is a decorative plate. Depending on which model door knobs you have, it is held on with a "set-screw" that might require an allen-wrench (looks like an 8-sided tool; usually in an L-shape), or just simply a screw driver, to loosen and remove it. Once you take the decorative plate off, there will be two very obvious screws that hold both sides (inside and outside) of the door knob together. Tighten these screws to tighten your knobs, then put the decorative plates back on again.
When you first tightened the screws, the mechanism may have been loose enough to allow the actuator bar the connects the inside knob to the outside lever to work loose. When you tightened it you may have jambed that tight so things didn't work. When you disassembled everything, you may have lost that part. The springs are usually integrated into the catch part and are not removeable. Sometimes it helps to take everything completely off the door including the catch that goes in the edge of the door. Then reassemble it on a table to see what works and what doesn't. If that doesn't help, take all the pieces into Lowes at the key desk and they will be glad to help you.
A couple of ideas:
Sometimes the top of the knob is a cap which can be levered off with a sharp blade. Or, there is a grub screw (which may need a hex key to turn it) in a hole on the underside of the knob.