I received two Pc Engine Duos today.
The black Duo (above) seems to have the same caps as the Game Gear, the shining chubby type. They are of crap quality and need replacing. I also don't have any power plug that fits into the Duo so I can't test it.
The Duo-R (above) has different caps, nice black/blue ones. But look at the Hu Card connector, there is some serious vandalism in the middle of it.
I am thinking I might be able to replace the broken connector with the working one. I hope they are the same size.