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First thing is to check on the silver box is that there is a raised dimple in the metal, if it is not there DO NOT try to remove it.It does look like the valve has gone ( there may be other issues to ) so when you take the actuator off ( silver box ) what do you set it too ? And would it be ok to use it in this mode ( safe ) for about 6 weeks ?
If it has then there 2 screw under the cover to take it off.
The spider can only move a small distance side to side you simple move it to the middle of its travel.