Disassemble the Loose Temperature Handle

What happens here

Examine the loose shower handle, which in this case is the temperature mixer. Grip the handle and rotate it to confirm the looseness. Locate the outer ring or cap on the handle, which often unscrews to reveal the set screw. Unscrew this cap to expose the inner workings of the handle and the set screw that secures it to the valve stem. For this Grohe handle, the handle detaches from the main body, revealing a single set screw that is significantly loose.

Goal: Access the set screw to tighten the loose temperature handle.