No reason to be sorry 
If you loosened the “ring” (equal to lock ring, groove nut or the part 5 in the rectangle 130-00 shown at the detailed parts drawing, page 12 of the manual) - which part do you mean with the nut?
Strida manual
No reason to be sorry
If you loosened the “ring” (equal to lock ring, groove nut or the part 5 in the rectangle 130-00 shown at the detailed parts drawing, page 12 of the manual) - which part do you mean with the nut?
Strida manual