This is the most effective solution to protect my Brompton joint paint. To keep my Brompton paint as new as the first day you bought it.
The protector made by special soft rubber which could divide the clamp and the hinge joint. Which can effectively avoid friction and collision between clamp and joint.
Not only for JK Knob version but also available for original Brompton clamp. (This protector is compatible to Brompton A/C/P-Line.)