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I think you are right, the resistance of the HV coil wire ends up being in series with the shorted turn and thus reducing the effect of the shorted turn on the ringing response.
One other thing you can try.. remove the solder from the terminal which connects to the plate cap of the HO and remove the flyback wire which goes to the HV winding and leaving the flyback wire going to the primary attached to the terminal. Run the ring test again, and you should see a normal response, proving the shorted turn. Of course, doing this does have some risk, one could break either of the two wires in such a way that they could not be repaired. But as the flyback is most likely NG, you don't have too much to loose.
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John Folsom
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