Sweep wrote:I have three bikes which although now converted to V brakes still have that hanger fitted - I did once try to remove one as it severely restricts access to the bearing cup hexnut, but unless I am mad found that I had to retain it so that the headset assembly secured properly.
It sounds like the one you tried to remove is the same design as on my bike, which uses relatively thin metal and a lip which curves down over the adjusting nut e.g. like this one
, presumably increasing the rigidity and strength of the hanger, but at the annoying penalty of restricting access as you say to the adjusting nut.
I cannot imagine why you would need to retain it having switched to V brakes, but you can buy better quality cable hangers without that lip, e.g. shallow ones like this one
and deeper ones like this one
. A deeper one is likely to be the better choice if you have aero levers with cable underneath the bar tape, especially if your stem is relatively low/short, because the cable will likely need a much tighter radius bend with a shallow hanger.
Edit - If you do want to change the hanger, you should probably first check your existing hanger and the steerer for compatibility with any new hanger. The first link above shows a hanger designed for a steerer with the rear facing part of the thread filed flat, the other links show hangers designed for steerers with a notch filed in the thread.
My own bike has a steerer with no notched keyway or flat surface, and the hole in the hanger is completely round, which is annoying as I had planned to replace it with an old shallow one with a notch which I had spare, specifically to address that problem of the lip covering the adjusting nut.