@bibre,
I have WSU-30M apparantly. Looks just like the one in the picture above.
The M means modified. Have to read the Oki tools description, somehow it lets the wires wrap a little differently to start.
The long end wraps, the the short end unwraps.
@Terry,
Pin D3 is connected to Vcc, Pin D8 is connected to ground.
D being the 4th strip, 3rd & 8th holes.