I've ben watching some vids online, is this security you mention the up turned metal tag? I watched some guy grind it off the top of the spear housing.You need to defeat the security on the spear first....
It's surprising how many Utrube vids relating to kegs have sod all to do with home brewing, and why the hell do gym dudes want to pull em apart, surely those guys have enough weights and stuff to pump!!