Hey Russ,
I'm glad your taking suggestions, I think I've got a good one for ya', and very relevant to everyone's needs, how about machining a "BORDEN DENTAL PLUG", just ready to install into a helmet, no need to buy the piece first and then go ahead and cut it down. Aluminum rod with the 3 holes drilled in it, with a trim rim ring on the backside as a stopper. What's yours and everyone else's thoughts?
THX
Eric
:cheers