My twelfth Raleigh Aheadset conversion has worked out perfectly. This time it's an M.Part headset. These are really good, as they're very well made, cheap, and include the rare 27 mm crown race that's necessary for Raleigh forks. The original (and rather rusty!) headset top nut is used as a bearing pre-load tensioner. The clamp is an "old school" BMX 1" seat clamp. The clamp locks the headset and secures the stem at the same time. The stem's vertical shaft started life as a steel MTB handlebar. Being 7/8" and one end and !" at the other, half an old handlebar makes a perfect adaptor for using modern Aheadset clamp-on stems with a Raleigh Twenty.