Bobbb, I nominate you for "troll of the year" award. In 9 months, you've managed to post about 15 times about a 5 minute repair! In 1/10 of the time you've wasted posting your prattle here, you could've:

1: bought a new set of chainrings
2: bought a new cassete
3: bought a new chain, and
4: installed them

Freeing up time for you to waste on more worthwhile pursuits, like trainspotting, Morris dancing, or attending Star Trek conferences. Instead, you waste time and bandwidth, proving to all here that you are mechanically incompetent, write poorly, and have problems with prioritizing. You talk, but you don't listen. In the end, if a truck backs up and runs over your bike, it will be doing both yourself and all of us a big favor.