Today I replaced my showerhead (success and very easy) and I adjusted the temp on my shower. But now my shower only runs warm or hot water.

I'm not complaining! It's better than cold and lukewarm water only as before. But what did I do wrong? I'd just like to know for the future.

It's a single valve fixture. This shower is so old, it doesn't appear to have the safety stop present on newer valves.

"In the depth of winter, I finally learned that within me there lay an invincible summer."

4a, mbl, low porosity, normal thickness, fine hair.