I did the same type of test with the KC trucks with and without the brass eyelets. I used two examples of the same car. One with the eyelets and one without. I did not push the cars, but set up two tracks on a slope. The car with the bushings rolled farther and smoother than the one without. I didn't do any of the math required to calcuate the force that was applied, but there was a significant difference. think I'll repeat the experiment and calculate force applied and distance traveled to get a more precise result. In my opinion, it's definately worth the buck or so per car to retrofit.
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