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Isn't it possible to create a plug that covers the 2 screw holes, and use that as ground? just like the actual 290. Or are the screw holes not ground?
I just think it would be easier to develop a cord that would just screw to the top rather than try and make a spring loaded peice of metal.
unfortunately the screw is very unlikely to be connected to ground especially as the +V pin is right next to it, also the only real problem with not using something spring loaded is that you get a very loose connection as I found out when I first stared testing my cable, also if you use a material that doesn't bend or spring back then you could risk damaging your PSP's DC out connectors.
I press the down button after going into GPS info mode. And it doesn't change the Mhz speed to 111. I have it currently on 89 Mhz. Which is set up at that since I got this software onto the PSP.