If you have ever had to remove the rear triangle of a Brompton you'll know that the pin is held in position by two Allen head machine screws with a UNF thread that are thread-locked in place. Removing it is typically a pig of a job, because once one screw has been removed, there's nothing to stop the pin from turning when you try to remove the other screw. In my case one of the screws was already loose, but no matter what tricks I used from the interwebs, the other one was staying put. Some people advocate taking a hacksaw to the hinge screw, but since I wanted to keep the screws and the triangle was already scrap, those of a sensitive disposition should look away now because I took my hacksaw to the triangle. To avoid this hell in the future, using a rotary tool (a Dremel) I cut a slot in each end of the pin, just deep enough to be gripped, but not so deep they could impact the bearing surface.
