In article ,
jody m wrote:

replying to Senin, jody wrote:
I'm trying to replace the handle cartridge for our Moen 1225. We cannot even
get it unscrewed to begin removing cartridge.

Did you check the Moen website?

https://www.moen.com/customer-support/cartridge-replacement

They have an 800 number you can call for help, if their video is not
enough. When I replaced mine, I recall it was quite a task.

Fred