Let's have a caging a chamber and removing a diaphragm 101
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Here is the caging tool and where it goes. It gets twisted after inserted then tightened all the way down.
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2 good tips here. First if u release the emergency brake first air pressure does most of the work u only have to crank down the last few turns manually. Also the threads go deeper than a deep well will go and this rachet with hollow sockets works great here.