For anyone interested in converting a volvo cigarette socket to a USB port I found this kit at Jaycar for under $15.
Use the usb hub and plastic nut , above shows left over parts.
Kit comes with wired up inline fuse from the usb hub.
Using a small flat blade screw driver to unclipped the plastic collar that also holds cigarette socket from cup holder , in this case its a 2014 XC60 centre console.
Note: socket and plug removed and sitting in top left of photo.
It also allows use of the rubber cap to stop coffee spills into usb.
Bonus in the XC60's case was that the usb now sits low enough to have charge wire plugged into phone sits low enough to slide the lid closed.