In my first job after I moved to Cali (early 80s) I worked for a firm that made 2-way radio test gear. While there, I encountered a curious bit of hardware meant for providing a central star grounding point on a chassis, It consisted of a little turret that you screwed down to the chassis. It had on top a circular hub pierced all around with holes, so you could insert all the ground wires you wished to terminate at a given point. My colleagues used to call them "ground wheels", but if you search by that term or other obvious variants, you get everything but that. Does anyone know the exact name for this part? Engineering is like magic in some ways - if you don't invoke the demon by his exact name, he won't come.