The circuit boards use pads instead of pins for the ICSP connection, which means I use pogo pins to connect the programmer.  I made a handy setup to hold the board in place while its firmware is loaded.  

Unfortunately the black part that holds it in position is a little loose, so there's a bit of a jiggle required before it connects, but it's still much better than holding it myself.  

The clip holds a scrap piece of aluminum with some shrink wrap on it.  I can lift up the free end and slide the board in place.  When I get it correctly positioned, the power LED lights, and I can program it.

I use electrical tape on the aluminium frame to prevent the pads on the bottom from shorting once installed.