Touchpad very stiff click

Someone used Blue 243 Loctite on the threads. This screw is the click adjuster, while you should be able to turn it, someone over did it locking it down using the wrong product! The proper way to prevent it from loosening up is to use Purple 222 Loctite or what I use, clear fingernail polish dabbing a small dot across the case and the screws head. This then allows someone to break the seal by turning the screwdriver, yet prevent it from losing its set point.

To undo this mess you’ll need to use either a solvent or what I do is use a soldering iron to heat the screw to soften the adhesive. I would take it fully out and clean the threads using Toluene solvent (use it in a well ventilated area).

Follow this guide to fully remove the trackpad Substituição do trackpad do MacBook Pro 13" com tela Retina de meados de 2014 as you’ll find turning it down and out easier than easing it out. Besides you’ll want to clean the edge of the case as well as the trackpad as I’m sure the grit and other junk is messing you up here.

And yes Apple made this overly hard as you’ll need to pull the battery (a bad design choice which they corrected in the 2016 models and newer)