Loosen if the visor is locked in place. These sleeve nuts are not cheap to produce, they have been extensively tested.
Lumos Bicycle Ultra Visor Helmet Visor XL Black Safety Replacement Shield Accessory
Helmet Visor for MT THUNDER 4 SV Helmet MT-V-28B Replacement Helmet Face Shield
Motorcycle Helmet Parts Accessories Helmet Visor Base Lock for AGV K1 K3SV K5
Motorcycle Helmet Parts Accessories Helmet Visor Base Lock For AGV K1 K3SV K5
