"Dave" wrote in message tnews.com...

What sort of plate caps were used? There are just pins, and
it looks almost as if there would have been a ceramic gizmo
like a tube socket to have bridged the two of them....

Fahnestock clips work fine, and they're easy enough to find (e.g.
Mouser), and they even add a bit of heat-sinking. BTW, to connect
both plates in parallel, put a clip on each plate, line them up
together and run a connecting wire through the screw holes, then
solder the whole thing (quickly) and you'll have a perfectly-fitting
dual plate cap.

73,
Mike, KK6GM