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easiest way to modify for blanks is to tap the booster from the back side and install a short bolt with a hole. 3/16" (i think) to let the gasses out. Tap size is somewhere around 1/2", it has been discussed here before with the dimensions. Use the search button and dig for a little and you shall find.
 

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I you are doing the machining yourself just make a slip fit or even jam fit bushing into the booster. All you need is a scrap of aluminum with a slight shoulder on it to keep it from shooting out. Drill it out until it will not function any more then make a real one that threads into the booster. ALSO, remember that if you are using a shorter than standard barrel you may need to adjust your booster size accordingly, just like when using live rounds.
 
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