step 1: buy a caliper to accurately measure the part of the headset that inserts in the frame head-tube .

that is a significant piece of data, the other is the fork crown race seat diameter .

armed with that data you can ask better questions of the sellers..



My old Mk2 Brompton I removed the axle bearing cones and used Grease on them and put it back together ..

Then did the oil down the hole where the indicator chain goes , for the gears inside.

+ I put KoolStop's continental model salmon compound brake pads on .