When I first got my F4, I noticed that the mirror mounts have a bit of play where the stalk meets the base. Didn't take me long to realize that if you wedged something in there to cause the mirrors to tip up and outward that it improved the rear view. A trip to Lowe's yielded an 1/8 inch-thick rubber washer. I cut two small pie shaped wedges, then inserted them into the gap on the inside corners of each mirror. The results are a significantly improved ability to see to the sides and rear. I can actually see other vehicles behind me now. Amazing!!! The pieces are not glued, so if I had to remove them it only takes a few seconds. I think there is enough friction there to keep them in place without adhesive.
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