Originally posted by C_Jones Make sure you have unlocked the trigger from the base (a turning piece above the foot (base) of the trigger). It locks the trigger down if you turn it one way and loosens it if you turn it the other. Also, when it is not locked, if you sort of jostle/twist the trigger just slightly from side while putting some pulling pressure on at the same time it will loosen the trigger gradually out of the camera hot shoe and eventually come fully out. Make sure only to slightly twist lightly side to side and you will also see how far it (the trigger base) will move side to side in the hot shoe while slightly pulling so it will come out.
In addition, try turning the camera upside down while doing the above. Even though it's spring loaded when fully functional, gravity may help to let the locking pin slip out if somehow the spring broke and is jamming the mechanism to pull it up.