How can I remove a single temporary key mapping without resetting the entire keymap?

So I saw this question the other day. The user's K key was broken and they wanted to map it to Right-Shift. A good answer popped up and I thought I'd test it to see if it worked. I ran:

xmodmap -e "keycode 62 = k"

I did this under the understanding that I never use Right-Shift for anything. It turns out I was completely wrong. I use it all day long.

I've been filling up documents, corrupting commands, even almost deleting the wrong things (with Right-Shift+Delete). It's been a roller-coaster of emotions, but now I want it to go away. I'm sorry universe.

I know I could reboot or even just restart X but I have a load of things running and work to do. Can I just remove the mapping that xmodmap has created so that Right-Shift is just Right-Shift?

In this case it's just a single mapping (so Etcher Sketch approaches will work for me) but assume I have other mappings that I want to keep.

Try:

xmodmap -e "keycode 62 = Shift_R"

I used xmodmap -pke to see the list of current mappings, and look up Left-Shift. The right one follows from symmetry.