My Flevo Oke Ja uses a YST 541 headset, which is knackered. I've done a lot of googling to try to find a supplier but no luck - I think they're no longer made. The design of this particular headset is vital to the construction of the Flevo. It's for a threadless steerer but uses a threaded collar which slips down over the steerer which then locks in place. The upper bearing cup screws down off this to load the headset. Does that make sense? A conventional threadless headset (with bolt and starfangled nut) can't be used as the handlebars are about threefeet tall and have the actual handlebar welded across the top of downtube (this slides into the steerer and is held in place by a clamp). So, what now? Does anyone know of a source for the YST541? Or of a similar design headset (1 1/8 inch). I might be able to get a way with replacing the lower cups with some from a standard headset and keep the upper section, as the wear appears to be is in the lower. I've got Future Cycles having a look for me, but thought I'd appeal to the massed minds of urc too. Tim -- fast and gripping, non pompous, glossy and credible.