Scottes,. can you take the RC4 release system off of your 490?
Psychonaut.. just to clarify.
I am not guaranteeing that this is the case with all Manfrotto ballheads... I was guaranteeing it for the Giottos.. which has a standard threaded stud,. and thus any QR assembly can be attached. I also know that heads like Kirk, Arca, RRS will allow factory installed QR's to be removed and replaced..
But I DON'T KNOW that this is true of every manfrotto head. I suspect it is.. but truly,. I don't know this for sure with those heads in particular. Sorry if my post was confusing.
re: RC2 and secure antitwist....
In addition to the rubberized top and stard threaded screw that threads into the bottom hole of your camera or lens plate.. the standard RC2 plates all have THREE threaded holes in them for "Set-screws" (set screws do not thread into the body or lens,. but in fact simply apply additrional pressure, creating a firmer lock)
I have never had to use the set screws.. but they are there.
I also have not purchased the different "antitwist" RC2 plates.. I get by fine with the standard ones,.. but they are there if you need them.