Just a simple header. Design was done in ExpressPCB software. Design file.
Cut them apart with a Dremel tool carbide wheel. The UNO pin numbers are marked on the board. The only out-of-line pin is Vcc=3.3 volts, which is on the other side of the UNO board from the SPI connection. We used the RF24 library from maniacbug, but changed the Getting started sketch slightly to handle transmit/receive pipe switching and to fix an undefined flag, AutoAA.