You shouldn't have to solder anything... the male pinhead rebuild has the D0 already connected to it. The white PCB sits on top of a solderless adaptor which has a D0 spring wire. That D0 connection is then sent through the white PCB and into the rebuilt male pinhead. From there you can slide on any gen 4 mod for use. There's even a female rebuild on the White PCB for chips with male adaptors (i.e. X-Bit, etc.) So it really is solderless. The only thing you would ever have to solder is like Lan and HDD light wires on the X3.