Tried all 4 pins, although all I really needed was fiberglass. Brass and steel handles hold up well, but you shouldn't start scratching anything with metal right away. A nylon brush is useless. You might as well buy a $1 baby brush because you won't scratch anything with the soft edges of this nylon. Finally a fiberglass grip. I tried removing about 1" x 0.5" of the PCB cover and it did NOTHING to remove the cover. Once I scraped off the top layer with a separate metal spatula, I was back on the fiberglass for polishing. PUF. The whole section tried to disappear into the enclosure. I pulled it out with tweezers and squeezed the holding piece so tight I could barely get the pen tip back. First turn around, a little resistance, then everything disappears again. If you need fiberglass specifically, DO NOT BUY THIS PACKAGE. Spend a few bucks more and get a quality product that can be used at least once.
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