I was actually waiting for somebody to ask that question.....eventually
Both visors were mounted in 4 positions - both ends of the temple, forehead & even on the snout sections. Visors were drilled with holes on their mounting positions & fiberglass putty was used to adhere both visors to the inside of the helmet.
Sorry for the reso of the pic below, but those round tan colored spots you see on the visors are the mounting positions or the fiberglass putty (resin mixed with fiberglass & patching compound) - very strong bond!
You have to use a grinder & grind those mounting positions to bits before you can remove the visor!
Mardon (MLC)
mlcallanta@gmail.com