I epoxy a steel bar, bent at just the right angle, to the insides both cheeks near the bottom of the helmet. I did this with my ASOK GMH when one of the cheeks started to warp a bit when I cut the visor out. My epoxy job accidentally created the classic ESB flare.
With my FPH2, I epoxide the bar into the helmet BEFORE cutting out the visor to maintain the flare these helmets have already.
BTW Metadude, I'd love to see a vid on the DP helmet history. I've bookmarked the threads you posted for reading later tonight.