I received 2 packs of these pens and they looked great when they arrived. I checked the knobs, they work as they should. Spins easily and has no sticky dots. I built one into a pivoting headlamp and it was very easy to install. I like the little washers under the screw. It's as easy as just slipping a wire under a screw and tightening it. No broken screws. They are perfect for my needs. Should last a long time as the bulbs I use are LED and don't get very hot. Old bulbs usually ruin these cartridges with high heat. The phenolic plastic near the knobs tends to fail first. Overall, they are unbeatable in terms of price and performance. If I need more, I would take these again. Hope this helps you decide.
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