I had to replace my valve stem on my shower, it was an older style with the 3 knobs (hot, diverter, cold). I have the valve stem out and replaced but trying to re-attach the Flange is for some reason overly difficult.
Now I believe it's due to the buildup of whatever is inside the Flange (image below) because I can't get it to attach to the valve stem even when it's not attached in the wall.
Before I purchase a new Flange, the issue seems to be the "threaded piece" inside the Flange… is there something else I can try to get this to work?
I forgot to post also that my googling seems to show pieces that do not include the "threaded" part…for example this link