One of Shek's Repairs
Fire Button Fix
There's a silicone grommet that surrounds the fire switch, which has tiny extension arms coming off of it's corners. These 'arms' are what holds the fire button cap in place and keeps it from rattling. This is why the 20W fire button rattles, cuz it doesn't have a grommet like the 50W. What happens during assembly is that factory workers are so rushed to get them together that they mash these silicone arms so they're resting on top of the actual fire switch...and not holding up the fire button cap. So when you try to push the fire button cap, it feels like there's something in the way and why it feels "mushy". It's also why you've gotta press it hard to get it to fire, cuz those 'arms' are sitting on top of the actual firing switch causing a blockage. To fix this issue, you'll need a T6 Torx bit to remove the self-tapping screws on the top and bottom end caps of the iStick. You only need to remove the two top screws....
Be sure to turn off the device FIRST before you start taking it apart! Then hold the black plastic screen with your thumb and gently pull out the internals. You don't have to pull everything out completely, just enough so you can see the fire switch and the grommet around it....like this here:
Ya see that silicone grommet with the 4-legs surrounding the fire switch? That's what's causing the problem. So what ya do is when you push everything back into the enclosure, you wanna slide it in at a slight angle....so that the opposite side of the internals goes into the enclosure before the fire button side. This will keep those legs from getting mashed and they'll hold up the fire button cap properly. You wanna aim the fire button cap downward towards your work space when you reinsert the internals. Gravity will hold the fire button cap in place while you maneuver the internals back into the enclosure. Once everything's back in the enclosure, test the fire button to see if it's clicky and no longer 'mushy'. If it feels right and there's no longer any blockage and you can easily press the button, reinsert the screws and seal it back up.