| The tool I created looks like this: 
I slide it over the studs and MC push rod like this: 
It twists apart. Be careful not to bend the studs. Insert the tool so that it is as flush as possible to the booster shell. Here is the rubber reaction disc that has fallen out: 
Here is where I found my disc when I separated the shells of the booster. It is supposed to go in the middle hole: 
Here is the reaction disc installed behind the MC pushrod: 
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