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I believe that the general rule is that if the top of the steerer is below the centre of the upper binder bolt then you'll be ok; however, I'm not sure how I'd feel about that on a single-bolt stem.
Courtesy of gbj_tester one option is, after you've adjusted your headset and tightened up the stem binder bolt, to tighten down the headset pre-load bolt nice and tight. This shouldn't cramp the headset bearings since the stem shouldn't move down if the binder bolt is tight enough, but should prevent the stem walking off the top of the steerer. Presumably if the stem were to start to loosen it would also rapidly stiffen up the steering as a bonus warning mechanism.
ffm
My gut feeling is that this is just about ok - but want to check in case there are any horror stories out there 🫣
(Moving this fork over from another bike and the steerer not really long enough )