Making stock BPV adjustable?

Anybody try this yet? I may be definitely dating myself but, back in the day before widely available aftermarket BPV/BOVs, this is what we had to do. Anybody want to send me one to experiment on? (wiggle)
 
i don't think anyone has done this. I know someone had actually crushed one a bit. I guess it's an old dsm trick?
 

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