I see. You should make a moveable rangefinder. It makes a cooler helmet and also more comfortable when you wear it under your arm.
I know it will be harder, but i´m sure you´ll can find some tricks on these forums.
By the way, I´m about buying a JD helmet. Have you got any rubies helmet? Because if you could make a comparasion picture beetween rubies and JD I would be very pleased
take care