Joystick got broken.

I guess I don't have to tell you which Joy con is the favorite. I'm sorry that MarioKart wasn't kind to you. Let's get that broken joystick replaced for some more child abuse.

Got the replacement. This was about $15 for 2.

The package came with 2, and some thumbcaps. I guess I have one at the ready for the next time this happens. I'm not going to use the thumbcaps because they will get lost and possibly end up in my dog's mouth.

Special screws!

This is typical of Nintendo. I guess it's easier to buy a new one if you don't have a screwdriver to get into it. Not this guy.

I have an assortment of tips for this reason.

I used the Y2 for this. As you can see I already put it in my screwdriver for this picture.

Cheap set. So of course, it doesn't fit.

The tip was a bit big, but not by much. I still have something for that: a file. It took only about 3 swipes on each of the 3 recesses to have a good bite on the screw heads.

The insides.

This is where the fun stuff is. A quick glance indicates that I should pop the battery aside and the middle assembly screws should be visible.

I have my screwdriver pointed at each screw in each picture.

Board.

I really should have disconnected the battery during this operation, but the connector was being stubborn.

The home button ribbon goes right over the joystick mounting screw.

Simply flick up the grey tab and this ribbon can be pulled out of the way.

Next: Joystick connector.

The tab for the joystick ribbon flips up the opposite side as the home button ribbon.

Unmount it.

This step seems pretty self-explanatory.

Ribbon cable first.

The ribbon cable is a bit easier to put in before screwing the joystick down. I had to elevate the joy con because there's a joystick there now.

Assembly is opposite of removal.

The home button ribbon can get in between the joystick and case if you're not careful. You'll notice when the mounting screw doesn't want to go in.

The crew.

These are the tools I used for this. I'm not including Mr. File since the bit ought to have been the right size from the store. Y2 bit, 000PH bit, 5/64 flathead, and reverse tweezers.