Definitely a knackered switch. The knob probably switches the common earth for the motors in each mirror so it looks like it's earthing both mirrors when it's in the R position. Like @Paulster2 said, you need a new switch. Try and find a service manual (there's usually PDFs floating around on the Internet) so you've got instructions for getting the door card ...
Gorilla glue or Loctite should work well. Loctite is used on airliners.
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From commercial airlines to space shuttles, Loctite’s adhesives are industry leaders in aerospace ...
I would use something from the Sikaflex range:
For example, Sikaflex 221
This is used for Lotus Elise repairs and bonding various bodywork. It has some flex but is very strong.
That said, most mirror glasses attach via clips into the housing, so make sure either a clip hasn't broken and ...
The heated mirrors have a restive heat strip spiraled around the back of the mirror. It works much like the defrost "wires" on a rear car window but since its a mirror, you can't see them. The MkIII Jetta didn't have a control for the heated mirrors - they were always on, and would fail more often than the switched ones on newer cars, but failure does ...
It appears that the mirror is placed over the "closer than appears" warning. This would indicate that it's an aftermarket item.
Your idea of using dental floss is a good one. The adhesives on these aftermarket mirrors are a very thin foam double-sided tape. Your objective should be to slice the foam in two pieces edgewise.
It can be done with small ...
After considering my options, I decided to go for a contact adhesive rather than an epoxy. I was concerned that after hardening the epoxy would become brittle, whereas the contact adhesive looked like it would stay more flexible.
I thoroughly cleaned both the back side of the glass and the (heated) rubberised plastic mirror holder, after realising that it ...
The mirror glass is fixed by adhesive pads, which usually come with the replacement glass. Use a heat gun on the old mirror glass to soften the glue, and gently pull it out. Wear gloves, in case of shards.
Clean off any remaining old glue pad with alcohol, then put the new pads on the glass, and gently push into place.
If say you removed the handlebars it would give you much better access to the area to work. Once the bars are removed along with the throttle grip, I would possibly try a mini hacksaw to remove the bulk of that old braket/weld, then VERY carefully grind away the old bracket.
I say VERY carefully as you don't want to damage or remove material from the ...
The mechanic installed the wrong part. The mirror glass is available in three versions with different curvature (flat, convex or aspherical). Which glass is used where depends on your country.
In Germany, VWs have an aspherical mirror on the left side, convex on the right side.
Convex and aspherical mirrors help reduce blind spots. In an aspherical ...
i think the hairdryer trick isn't a bad one.
to remove residue adhesive, i have found "Goo Gone" very helpful. i'm not sure if there's a generic variant of the chemical, but i was going to recommend that once you get the adhesive backing-residue off. i have had much success in removing super-stubborn adhesive residue on surfaces like this.
The first and simplest reason is that glass is cheap cf. a plastic that will support the uv rays that will hit the mirror during use. Then, the glass is designed to shatter into small pieces when it gets broken not forming shards which are more likely to cause injury.
Some cars have plastic headlights and we now have to buy products to reduce the ...
Without knowing what the car is, pull the door trim and disconnect the mirror in question. There may or may not be a disable button, check your owners manual.
If the mirrors automatically open and close than assume it's computer controlled and disabling the fold mirror button will not do anything.