I bought a monopod and ball head when I first got my 100-400mm. I used it a few times but found it to be annoying and more bothersome adjusting it than not having it on at all. I used it maybe two times and ever since I just use the monopod attached directly to the lens. I have other heads now and am going to sell that one, but I paid 4x what you gave for the monopod for just that head.


Try it without for a bit and see if you really just have to have one.