I think you mean the adjustment knob, because the swivel should always be able to move, it allows for better hose management. It can be removed but I do not see the swivel on the 2nd stage in that picture
If it is the adjustment knob you will need parts from an oceanic dealer or try scubaboard.com.You might be able to get some grey market stuff It Keep in mind scuba equipment is life support gear and someone could get hurt if it is done wrong
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