I'm not using them to replace a PSP but to fix the C Stick on my 3DS. All the devices I used had the same problem, they responded very badly, especially in certain directions. To my surprise the part under the rubber tab doesn't move at all but once you put the new cover on it works great. I just ripped the old one off, if you have a screwdriver to take the back off it's easy to take it out without damage, although once you tighten it you still can't get it back. Don't worry that you don't have enough space for a larger panel, as it is stationary and does not slide like a true PSP counterpart. I mainly use it to make Metal Gear 3DS more playable and it definitely helped.
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