Hey i know you lol.
Its not adjustable there, if i turn that shock oil will come pouring out, i know what you mean though like on real cars suspension, theyre are shims that sit between it and the spring collar, i believe i could find bigger shims but not 5mm, thats pushing it a bit on the dampers, i cant pull them apart further than they are when i had them out for cleaning
ps i just turned that nut to double check and were a bit low on oil in that shock now lol
