I've had my C3 pro for a few years now and now the chin guard dosen't stay up as solidly anymore. While geting a service at the Des Moines rally.. ( they replaced the notch ie things for the visor, now wonderful) Wyatt, the Schuberth teck, in front of me, took off the chin guard and showed me, once off how to increase the friction on the chin guard to help it stay up... He did it so smoothly I forgot how.......... I looked it up in the little helmet book.. They don't show how....... I thought earlier Schuberth s allowed to convert to open face... can anyone help me....... thanks, g rad