XRAY - Model racing cars

Hi,
In my X1 '17 I had a noticable friction while moving the upper arms up and down. To eliminate this friction and make them move smoothly on the pivots I grinded those pivots (part #373241) softly. I have used sandpaper 1200 and polished specially the 2 dots which left after a production process. After that I lubricated the pivots with very little of ball bearing oil and mounted them back into arm bushings. It seems to work much better now.
Do you guys have similar issues? How do you deal with that?

Cheers!

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The forces required to move people are large to begin with, and the biomechanics of the body can amplify those forces by the effects of leverage, or lack thereof. To analyze forces in the body, including the effects of leverage, we must study the properties of levers .