HI all: I'm brand new to photo.net and an amateur photographer. I have a "Hollywood Senior" tripod. It's sturdy and I quite like it, but I'm curious if I can replace the head that is on it. Finding out would involve disassembling it and I've run into a snag: there is a threaded collar that I can't budge, and I'm looking for anybody out there in the community that might have any input into what I can do to apply enough torque to loosen it without marring the aluminum (ie: hamfisting the thing into disfigured uselessness). I'm pointing to the collar in question in the 3rd pic. Any and all input would be hugely appreciated.