Am trying to disassemble my brompton so I can replace the headset bearings. The instructions are simple, loosen the headset lock nut, then loosen the screw in the middle 4 turns, then tap it down. Only tapping it doesn't seem to do anything. I'm guessing the expander bolt has seized in place. Does anyone have any advice on how to get this apart? Would taking the bolt out, spraying in a load of WD40, and leaving it to soak do anything? Bigger hammer?
Ideas welcome.
J