In this video I'd share the way I replaced my Kingsong S18 bearings. The bearings apparently start to produce some grinding noise. Turns out it caused by rusty ball inside the bearing.
I replaced mine with NTN 6203ZZCM which has zinc cover rather than rubber seal used on original S18. But you could use any other bearing as long as it coded 6203. Look for it's datasheet if those bearing could support your weight.
This is only the way I've done it. If you want to follow it Do It at Your Own Risks. If I done something wrong or mislead information, do send me your thought in the comment.

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