Thank you for your guide, it helped me fix my son’s iPad!
For wooden drawers without metal runners, I would rub the sliding parts with some soap. The glycerin with help with the friction. Good luck!
I don't think that WD40 is a good idea for long term lubrication. It surely cleans the tracks and the rollers but it evaporates quickly. I would suggest cleaning rollers with WD40, then wipe out any WD40 remains with a kitchen paper towel and finally spray some white grease or general light oil lubricant such as the one for sowing machines.
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