I managed to fix my sumvision kpac 2GB with mini SD(the one i couldnt take apart).
When i eventually managed to take it apart what i did was bend the pins in the earphone socket(the pins that make contact with the plug) to make it a tighter fit. the speaker no longer works but im not really bothered. The only problem now is i broke 2 of the clips and cracked the screen cover(whoops). also ive noticed the battery seems to be glued to the board with super glue! i wanted to look underneath it but if i pulled the battery off it would probably take the mini sd slot and the chips with it!