Delta single handle faucet leaks

In my opinion, and based on my experience with this type faucet, it is history. Replace it.

Spray with lubricant and let it work - you may have to spray more than
once - main thing is do not strip the screw head....try a long handled
screw driver.

Regards,
Dennis

need to replase o-rings also

On most delta models you pop the cap in the center of the handle. Then there is a screw to remove the handle. If it is old the bonnet can be hard to remove. Be careful, as you don't want to damate the complete faucet behind the wall.

if it leaking around the base of the spout...it would be spout o-rings....if it is dripping from the aerator then it is the seat and springs in the handle.

I have to assume you've unscrewed the face plate, not removed it, because you can't do that without taking the handle off. Delta handle usually come off by unscrewing an allen (set) screw just under the handle itself. Sometimes these are covered by a plastic plug.

Occasionally, even after you've completely removed the set screw, the handle still won't come off. Wiggling and pulling for a few minutes will generally get it off. If not, then a hacksaw, new handle and new cartridge are the answer.

If the allen screw is stripped and that's why it won't ome off, see above.

Good Luck.

Remove hot/cold button in handle, remove screw/pull off handle. Remove the two screws in the wall plate/remove plate. Use a wrench to remove the diverter assembly. Get new diverter assy and reinstall eveything. You don't need to turn off the water.

You can drill a small hole into the set-screw and use an easyout to extract the set screw

You remove the handle after turning the water off the to faucet. Remove the retaining nut which is apart of the trim. The ball assymbly will pull right out and you will find the two little washers and springs below the ball. You can buy a rebuild kit with the new ball if you like but it is not necessary. When you do replace the washers, it might be necessary to tighen the tension ring that is on the retaining nut. Tighten it unit it doesn't leak around the ball stem.