The BT headset that comes with Rider 2 is designed to open up via the supplied allen wrench and clamp down on the lower edge of the helmet, As I look at my helmet, the lower edge is very thick (a Shoei full face Multi tec).. so how does the headset screw down on the edge.. What is it that I am not getting? Looks like the clamp won't open enough so I can screw it down on th edge.. Do I need a new helmet? Will it work at all with a full face helmet?