Actually just doing my first build today, the ESPM-1 Explorer, it has a black bridge and i checked continuity before installing and it was very poor, so even if you scrape paint off the bridge plug, you will still not have a great connection unless you start scraping paint from all the contact parts.... these kits are fairly decent quality for the price, but it is a very poor effort having non conductive paint on parts that need conductivity.
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