Recent vintage blue based Blue Racer 2000 bugs (not a real Blue Racer) are an Original model on a narrow base. Despite the painted bottom, it is a Deluxe model key with synthetic ruby bearings which do not conduct electricity. A good key but with some problems.
Vibroplex modified the way it grounded the Deluxe keys. They removed the grounding braid and two small machine screws which attached the braid to the main lever and to the base of the key. Now the ONLY connection is the dot tension spring. Make sure you have sufficient tension on the spring to avoid loss of continuity.
Also make sure it's clean.
I wrote some instructions for cleaning and using bugs here:http://www.qsl.net/n1ea/bug_adjusting_cleaning_sending.txt
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