Big fan of helmet mirrors but not of the attachments so I make my own. A simple fiberglass piece, formed with a shape that the mirror clamps securely to. At its top, it is formed to fit the inside of my helmet visor. Drill two small holes and use nice SS screws. Outlasts several helmets. Near perfect, both for view and no-hassle. I take the visor off to clean the helmet anyways, so that is also easy. I make the mounts to fit the clamp on
Third Eye Round Helmet Mirror.
Ben