I picked up an old Brompton last week after years of curiosity, it's an L5 with the SA Sprinter 5 speed hub.
Just put on a pair of Schwalbe Kojaks and it rides well.
Looking back at threads and pictures I have seen a simple curved clip that is held by the seat post clamp bolt and clips over the rear frame to hold it in place when lifted.
I've seen reference to Merc having made these clips, but I can't seem to find one anywhere.
Can anyone point me in the right direction?
I know Brompton have the new design that has a built in locking mechanism but I'd rather not spend £23 if I can help it...I know, I'm tight.