Think I'd agree - if there's no space below the stem (no spacers, just stem clamped onto the steerer?) for a steerer hanger, then one of those widgets: Tektro did a sort of copy of the force 40 thing - I think it says something similar in the instructions (I've got a couple for situations where I've go no other option than use one).Martin":100h302c said:fasten in the mudguard hole.
Brands like Tektro also had parts for this kind of braking.