Delta RP70 Ball Assembly Replacement for Single Lever Handle Faucets

My review is similar to many others I've read. It is very difficult (if not impossible) to install this ball assembly and not have leaks later. I actually purchased two of these, thinking the first one may have been faulty. I've reinstalled this twice more and still have drips. I'm inclined to believe that the fault may be with the instructions rather than the ball. I think the trick is getting the handle fastened to the ball stem exactly right. The fact that one part of the ball stem is flat doesn't seem to solve the issue.

Faucet is like brand new.

Great purchase!

All the parts I ordered [...] were all original manufacturer specs. I have an essentially new faucet now!

Parts [...]were the real deal, and worked like a charm. With great prices I will certainly be a repeat customer.

Had previously replaced the washers and tightened everything, but the leak persisted. Replaced the the old ball with this Delta Ball Assembly, and bingo! - leak fixed, problem solved!