I have been using this type of mirror for many years. To hold the base block onto the helmet use a JBWeld putty called WaterWeld. You only need a small amount. The adhesive applied to the base unit is not strong enough to stick to a plastic helmet. There are other epoxy putties that will work as well. These are two-component putties that are activated when you pinch the putty between your fingers just before application. I drive about 5000 miles a year and the plastic socket that the mirror sits in falls apart after about 1 year. Then I buy a new unit and just use the mirror mount part and throw away the new base unit. It took me many years to figure it out, but I love having eyes in the back of my mind.
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