You can use what they call "poormans fiberglass." Basically, a strip of material from a white shirt, drenched in super glue, and glued to the back of the hovi mic spot on the inside of the helmet. It just reinforces the thin plastic to where it shouldnt crinkle when touched. The mic tips should not sit flush. You can do this poormans fiberglass, then thread the bolt on as tight as it will go, and perhaps use some loctite to keep the nut from coming loose.
Mine come loose from time to time, but I have not tried any reinforcement just yet. I keep meaning to but have been simply enjoying time off from building armor with the fam