Xbox One Left And Right Trigger Not Working For Mac

My Xbox One Day One Edition controller has had a 'rattle' since I unboxed it on launch day. I could tilt the controller side-to-side and it sounded like there was something inside moving around. However, there was no issue with any functionality, and rather than doing anything with it, I just ignored it.
Yesterday, though, the right-side trigger stopped working - as in, stopped being able to be pressed in, so it wouldn't activate, like something was stuck in there.. and the 'rattle' was gone. Made sense that whatever had been rattling around finally moved to the wrong spot and got lodged.
I tried to open an Xbox service request for repair or replacement but, while support was very friendly and helpful, the controller is only covered by a 90-day warranty and it won't be addressed. A quick search showed me that the sides of the controller 'pop' right off, and with an unusable controller with no warranty, what's to lose? I opened the right-side of the controller (which took more force than I liked, but indeed did 'pop' right off), and sure enough, a small plastic piece came out and the right trigger functionality was restored.
This left me wondering what the piece was, though, and where it goes - and that's my mystery. A Torx T-9 bit and five screws later, I had the controller apart and don't see where the piece is supposed to go or what it does. I didn't disassemble any further than this, so I suppose it could go somewhere inside the main button unit?

Meanwhile, I've put the controller back together and verified it's working fine again. I considered taking apart my second (new last week) controller to compare, but wouldn't want to void that warranty should something happen with it. I did look for a few images with Google image search, but couldn't identify this part anywhere (I could just be missing it).
Here's a closer look at the mystery part


So.. Anyone know what the part is? Or am I victim of some random non-controller part being inside my controller from the manufacturing process?

Student-Contributed Wiki

An awesome team of students from our education program made this wiki.

This is a troubleshooting page for the wired PowerA Fusion Controller for Xbox One and PC.

You can independently adjust four motors: Left trigger, Right trigger, Left main (in the handle), and Right main. The motors are at a default of 100% and can be adjusted down to 0%. When you adjust these slides, this changes the intensity of the vibration.

Controller Won't Turn On

I keep pressing buttons and nothing happens.

It Is Not Connected To The Console

Unplug the cable and make sure you are connecting it in the right slot, then connect it again.

Defective Cable

Your cable may be defective and will not power your controller at all. If this is happening, you have to buy a new cable and replace it.

Controller Won't Respond When Connected To PC

I keep pressing buttons but nothing moves on the screen.

Controller Is Not Receiving Enough Energy

Ensure that you are plugging your controller into a USB port that will provide enough power for the controller to work.

You Don't Have The Right Software Installed

You might not have the correct software that recognizes the controller; check if you even have a software. If not, download one. If this does not work, test your controller on other devices, such as an Xbox console or another computer to check if the controller works.

Sticky Buttons

Some or all the buttons in my controller take too long to pop up

Dirty Buttons

The buttons on your controller might have food residue or just dust. If you want to clean them you will need a cleaning wipe and some alcohol. If that does not work, try opening the controller to clean them more thoroughly or change them.

Controller Will Not Vibrate

When I am playing a game, the controller won’t vibrate. Ih8sn0w icloud bypass.

Vibration Settings Not Enabled

Make sure the vibration option is enabled which is commonly found in the setting of the game you are playing. The vibration option may also be turned off from the console settings.

The Game May Not Support The Vibration Option

Try out a different controller to play the game. If the controller still doesn’t vibrate there is a high chance the game doesn’t support the vibration effect.

Defective Vibration Motor

If you’ve tried all the above and your controller still isn’t vibrating, you most likely have a defective vibration motor. If so, grab a screwdriver because you will need it for the Xbox One Wireless Controller Trigger Rumble Motor Replacement guide. This guide requires soldering.

Part: Xbox One controller trigger vibration motor

Tools required: TR6 Torx Security Screwdriver, TR8 Torx Security Screwdriver, Spudger, soldering station tweezers (recommended)

LED On The Controller Will Not Turn On

My controller is working but the led appears off

Burned LED

If your controller is working but the LED is not on, it might be because it is burned out and you will have to replace it.

Damaged Connections

Xbox

There might be a problem with the connections between the LED and the power of the controller. This could be either because it has fallen or a beverage has been spilled on it. The best option is to open the controller and check the connections with a voltage tester.