Preface: If you have a stubborn mirror retaining ring, here are some things you can do to loosen the ring up.
| Snap Ring Pliers | Mirror Removal tool |

Insert tips of the Snap Ring Plier into the holes on the ring as shown: | Turn counter-clockwise (left) to Loosen |
Use your pointer finger to put pressure on the head of the snap ring pliers to keep the posts in the mirror retaining ring holes |
Insert the removal tool into the Slots of the retaining ring as shown | Turn Clock Wise to Tighten, Counter-Clockwise to Loosen As Needed |