For a project of mine, I need to flash several hundred of ATMegas.
I use a special programming connector, which sits on the SMD chip and connects directly to the ISP and power pins on the chip.
My first attempt to ease the flashing process was to mount the programming connector to a lever with some additional weight on it. That way, once the connector was in place, I didn’t need to hold down the connector manually during the flashing process.
The PCBs come in panels of 40 (10 x 4 PCBs per panel) with milled slots in between each PCB. So to make the positioning of the PCBs under the connector a little easier (and more repeatable), I put two metal pins (with the same diameter as the milled slots) on the base of the lever.
Flash several hundred of ATMegas using a CNC – [Link]