Reassembly: When placing the back cover on: notice that the battery terminals need to slide inside the cover first. Then compress the triggers slightly, Then the cover will be aligned correctly. Then add the front cover and add screws so it doesn’t come undone.
PS: Rubber band to hold triggers down slightly helped a ton! Otherwise the trigger is over extending into the bumper assembly space.
Note: I believe the order is very important or the alignments on the left side may have the horn forced into one of the other close cavities and you won’t even know it. (This causes that horn to get damaged over time too. Without the horn, the bumper will drift and miss the button and bind up the trigger.)
Solution: Instead remove the outside piece mentioned in image… then remove the bumpers… Check that all cavities are clear. Then make sure the sync button is inserted all the way in… Then place the left bump in the far left hole first. Then ensure the horn part slides into it’s specific slot inside, then ensure the the sync button goes in hole…then continue to right bumper side…. Then add the over cover piece above it… Start with the piece that goes over the charge port. Then the front as the above image shows… Now check your bumpers for easy clicking… If it’s still not correct, remove and try again gently as the horns may snap off and the PCB may get damaged.
Reassembly: This hard is hard to mount. Slowly flip the controller upto view the charging port and notice it isn’t aligned yet… If you force it to outside of pcb, it’ll try to pop off. I’ve yet to figure this step out… I forced it and after full reassembly, the bumpers became REALLY stiff.