What Rufus said…
I don’t think you can do much except contact Mad Catz.
Even if you have to do a complete PCB change (and end up getting something other than the Mad Catz PCB like the PS360PCB if and when that ever becomes available again), make sure to at least keep the original PCB section that has the home button on it. You can wire/solder to that button and use it with a new PCB.
What happened with the stick probably (90% chance) isn’t your fault. Round 1 sticks (particularly on the 360 side) are prone to all kinds of failures. Whichever factory in China that Mad Catz used to produce the PCB’s did a horrible job with the original TE case (Round 1 AND Round 2) PCB’s.
(That lack of quality control in Chinese factories is precisely why more businesses are choosing to contract factories in the US. It may cost twice as much to contract in the US overall but the delay time between figuring out bugs and correcting them is far less when the factories are quartered in the US. Makes a huge difference when you have a tight production schedule and generally results in far fewer faults and problems down the line in production. Companies may actually end up saving money in the long run sticking with US-centered production!)
I like the stylized home buttons on the Mad Catz PCB’s and the new HRAP V3/VX’s. They’re set apart nicely and conveniently placed for when you want to exit a game. Like I’ve said before, I like to reuse as much hardware as possible with stick mods.