Yeah, I can imagine that's not confidence inspiring.
I've been using a Deda 1" with shim to 1 1/8" stem. I gave it a go half expecting problems. To my surprise it's been solid. I used fsa assembly paste on the shim and stem and grease on the converter/steerer tube interface.
I have in the past but it slipped continuously, may try and get a nitto one in the kinoko sale
And yeah @amey, was probably me