I would suggest that Mark sends his helmet back to Bell so they can check it. The D rings when the strap is run proper thru them only tighten when pulled on, plus the Bell visor does have a lock down feature so it doesnt fly open. I'm sure they would like to check it and would help Mark out if it is bad. Most companys do.
The Tmez helmet was because the painter didn't assemble it back properly so that wasn't a failure of the helmet.
Good to hear he is ok and hope to see you on the track soon again.
