The zero-hassle guide to removing Brompton rear pivot bolts – these can sometimes be a nightmare to get out, but this technique never fails. You will need:
– a good 4mm Allen key or two
– a long 5mm Allen key
– a mini butane torch
Heat the first bolt head for 30 seconds. Unscrew. If the other side starts to rotate, hold it with another Allen key.
Heat the other screw for 30 seconds. Insert the 5mm Allen key into the hole from the first screw, and lever it over as hard as possible. Unscrew the second screw.