Richard, I doubt many of us have to go buy a Kelvin Bridge Ohmmeter
from eBay to get what you're after.

I've got a Radio Shack meter with a 300mV scale; I've got a hefty power
supply with current limit, and I've got a 55 watt, 12V fog lamp. I'll
admit, I had to think pretty hard to figure out where I had a load
resistor to keep my power supply from going into overcurrent shutdown,
but it's on the premises, so it counts ;-)

I think I can do milliohm measurements of no more dubious accuracy than
the voltage and current accuracy of my Radio Shack meter in the
vicinity of 4.5A and 4.5mV

Long live four wire resistance measurements! Denny, I'd be interested
in whether or not lead resistance was a major loss component if you
want run a few amps DC through your cap lead / plate connection and
measure the voltage drop.

73,
Dan