Debuzzing a Wheaton TriPlanar problem

My original dealer is out of business now, and the only TriPlanar contact listed on Google does not respond. My problem: when initially turning up the preamp gain, the tonearm - yes ! - emits a loud buzz. All I have to do is grasp the shaft - wrapped in an inert cover - and the buzz ceases (mostly) for the duration of my listening session. I've grounded both the tonearm and VPI table in addition to the ground provided on the cable itself, and still the problem persists.
Might the Cardas arm cable not be shielded properly ? I have not a clue about rewiring a tonearm myself and cannot locate anyone in NYC to do it.