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they'll be a load of lateral force on the fork steerer that might walk the cups off of the head tube
No offense but this is really not going to happen. Remember that there is the whole ahead force clamping it down. If the lateral forces would actually stretch the material of the cups so they get loose then this would happen with every cup in the world. But it doesn't.
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But you're not applying the force in the same way.
In the traditional way the headset cup is supported on both sides, internally by the steerer tube and externally by the head tube. You have no support outboard of your cup because it goes over the head tube. I'm not an engineer but I can tell you your way is going to be significantly less effective.
jetski
I'm not sure this will work either, they'll be a load of lateral force on the fork steerer that might walk the cups off of the head tube.
I admire your persistence but nothing you make work, is going to be as effective as just using a 1" steerer.