try one layer of that cut it to 7"HXthe length. See if it works youll want to put the recone on and slide shim inside and see if its tight but not too tight sometimes I like to move the cone back and forth to get the shim snug but be easy when doing it.What about one of these deals i have laying around, i could rip off one side of the folder and use that as a shim possibly?
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