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Yeah, so it's fine in that sense and no different to another headset. It's more that any grit that gets in is in direct contact with the frame rather than a replaceable cup. Obviously you'd clean it out even if you had cups, but you could also get away with not doing so if on a multi-day trip. I'm toying with wrapping the gap between the headtube and fork with a strip of self-amalganting tape and then slitting it (so the bars can still turn) to offer a bit more sealing. The old school headset protectors don't fit tapered headtubes. Or maybe a thin o-ring type thing if it won't interfere with headset preload. The cane Creek 40 crown race has a rubber seal but grit did get past it. I split the crown race on cotic's recommendation but left the rubber seal intact.
Could you not just get another cartridge bearing and drop it in?