are some things called "carriolas" that are nothing more than a wooden frame with 3 ball bearings that are used to play mounted on them. I did a test once, children's things, I found 6 of them with a lot of rust, so they didn't even roll. To the 6 I passed them WD-40, 3 of them I left them with nothing else and to the other 3 I put lubricant for diesel engines castrol. Result? the lubricant of course won the race ;D
Ooo, nice :D
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