Help! How to grind finer? [Solis Scala zero static]

I have recently acquired a Solis Scala Zero static grinder. Using the finest setting, it takes only 10 seconds to achieve my desired dose-yield ratio (11gr in, 22gr out with a 51mm, 14gr basket)

I have seen some posts of people that have opened and tweaked the machine for a finer setting, but can't find any details. Does someone have any info on this? Thanks!