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I don't really see the point of a ballhead on a monopod. In truth i don't see the point of an expensive tilt head either - it's not like a tripod where you may need fine adjustments.
I have a cheap manfrotto 234RC on my 679B monopod, and it's more than good enough for my 70-200mm f/2.8.
Then you probably don't know the proper way to use a monopod for maximum stability It's NOT held
perpendicular to the ground....rather at an angle along side of your leg and wedged at the base against
your foot. The tilt head/ballhead facilitates the leveling of the lens. Don't really see the point of
using a monopod for the diminutive 70-200...but to each his own.
While someone may say "technically" that's the way to use a monopod, I've shot hundreds and hundreds of sporting events using a monopod and never once have I seen anyone--not a single shooter--use a monopod like this. So, like most everything else in photography, it probably depends what one is shooting and what their objectives are.
I have also not seen too many pros use ballheads and tiltheads on monopods. Most just screw the monopod right onto the lens collar. The few times I have seen others use ballheads, they seem to spend a lot of time keeping their gear from flopping around rather than just shooting. The idea when on a crowded sideline of an NFL game, for example, is to not have to worry about little things like ballheads and keeping the camera tightened down. Put the gear on a monopd and shoot. Simple.
Having said all that, I personally prefer to use lens plates and clamps. I like that I can quickly get the lens off the monopod and often use the clamps for a "fish-stick" set-up where I'm putting a body with a fisheye lens on the monopod to reach places I might not otherwise be able to reach. The clamps lets me do that quickly and efficiently. I also use the 681B and have had the same item--the very same monopod--for going on 10 years without ever having any issues with the monopod.
This video might help explain how I set up a monopod. I don't mention the "fish stick" set-up in that video, but probably will make one of those videos sometime soon.