Ken, You may have a problem using brass. It will have rather higher resistive loss than copper shielding. Small diameter copper tubing, such as is used to connect (say) a sink's drinking-water dispenser, is probably a better choice. In fact, even copper tape should be a good ad-hoc test, and not too much trouble (other than bleeding all over the floor from cut fingers) to apply. But do make sure whatever you use is terminated properly at the ends off the cable under test.
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