Deadheading Proteas

Hi
 
I have several Proteas that are flowering. How does one prune the flowers that have bloomed and are dead?
 
I have been breaking the head off at its juncture with the stem but is this the correct way?
 
Should I be cutting the flower-bearing stem back to its juncture with the branch or perhaps only cut the stem back leaving two or three sets of leaves?
 
Any advice would be appreciated
 
Charl
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