A coworker was wanting to raise his handlebars from the factory position. His bike has a 1 1/8 threadless headset. I suggested a stem rise or a stem with more rise to it. He also preferred more adjustment on height like on the quill stems. The thought subsequently occurred to me, one might use a quill stem with a threaded headset and get more rise than the 3-5 inches available from a stem riser and get some more adjustment. That would leave only the single collar holding the fork to the frame-I presume the stem is a backup against the collar failure so wasn't sure if one could safely operate a threadless headset with a quill stem. Anyone one know if that is feasible.