How about using wheel bearings? I am working on my M3 Stuart (still) and will be using them for my wiring going into the turret.
Jam a plastic tube up thru the center of the bearing to force contact between a lead and the inner ring then use a band clamp to hold its opposing lead to the outside. You can stack multiple rings, because the plastic tube that goes thru the middle of them is non conductive - just space each bearing out enough to prevent contact. - Martin H
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