If it has it, remove the set screws and stop by a hardware shop and pick up a set of strap wrenches, these are the kind that have the rubber strap you wrap around a part to loosen them, Bogen has made very few tripods with non-removable heads, they are becomming more common since the digi wonders have hit the screne, but most of them have removable heads.
And for future referance, the rubber strap wrenches can be a god send to remove, filters, lens elements, tripod heads and a host of other things that are hard to grip...I wish I had found them years ago, but can attest, I am in love with them now!!!!!
Dave