I've currently got an Ecrin Roc with a bracket for a CEAG speleotechnics lamp (with a custom insert from Bisun). I'm looking at getting a Phaeton Dual to replace the Bisun, and the Phaeton uses a go-pro mount. Presumably this means drilling more holes in the helmet, and I'm a bit worried this will weaken it. I'm loath to buy a new helmet because nothing seems to come close to the Ecrin Roc, and buying a 'pre-owned' Roc off ebay seems like a bad idea. Anyone got any advice? Should I just get a new helmet for the new lamp, or are helmets strong enough to survive two extra holes in the front?