Rearview Mirror problems of the 2001 GMC Sierra

Drivers side mirror vibrates at idle while passenger side does not. This condition worsens at highway speed or on bumpy roads, with no noticable difference in the passenger side mirror. The safety issue is that on 2 lane roads all of the taillights of the opposing traffic are flashing to the point of distraction. Also, I due to this effect of taillights being red and flashing in the mirror already, whether a driver would notice an emergency vehicle approaching from behind due to there already being flashing red lights in the mirror. The defect appears to be the breakaway joint not being tight enough to hold the mirror in a stable position as when I hold the joint the virbation lessens, and when I hold the glass against the housing the vibration persists.

Driver's side mirror vibrates at idle while passenger side does not. Condition worsens at highway speeds or on bumpy roads, with no noticeable difference in the passenger side mirror. Also, defect appears to be the break away joint not being tight enough to hold the mirror stable. The opposing traffic is a distraction because the red tail lights appear to be flashing, often mistaking them for emergency vehicles.