This adapter provides a Powerpole® connection for the DC power required. Designed and produced on a 3D printer, by an amateur radio operator, specifically for the Yaesu FT817 / FT817ND. I purchased this unit from ebay recently, and installed it on my own FT817ND. The installation only takes a few minutes and eliminates any worries about the current barrel connector.
All that is left to do, is connect a suitable length Powerpole® cable. As you can see, this modification will not interfere with the operation of the radio connections/ports.
For more information on Powerpole® connectors, see my post Where to Begin with Powerpole Connectors.