>> I usually used nuts to hold the unit
>> under test onto the tester, but one could also develop a hinged
>> overboard that holds the unit under test correctly.

The factory where I did my apprenticeship made jigs with pogo pins which 
contacted onto the pads where the wires were soldered when the PCB was 
assembled into the final unit, and had suitable diameter brass pins which 
went through the mounting screw holes, and a hinged brass frame around the 
perimeter of the PCB to hold it down.

Pogo pins are available from Harwin in the UK, through Farnell. Search for 
"Harwin probe" on the farnell website, and there is a whole variety pith 
pointed, concave, or serrated ends. 

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