Hey Jazzbo – Each of your rearview mirrors are held in place by two long bolts located beneath their rubber boots. Use a Phillips head screwdriver (or 12mm socket) to carefully tighten each bolt.
There are a couple of pre-cautionary steps that can make this job simpler –
Roll the end of each rubber boot (closest to the fairing) back over onto itself to expose the bolt heads. Try not to dismount the outer side of the boot closest to the mirror. It can be a real “Pain-in-the A$$” when trying to reposition the boots correctly if loose at both ends.
Before tightening the 4 mirror mounting bolts, place a gasket maker sealant on their threads. Do this one at a time only – so you don’t lose the mounting alignment holes of the other bolts.
“DO NOT” crank down on the mounting bolts too tight because the threaded ends go down into a soft and easily damaged base plate. Some owners will over torque the mirror bolts (rather than using sealant to hold them securely) and strip out the threads. Naturally if the threads are missing the mirrors will never stay adjusted – which requires replacement of the underlying mounting plate.