The Triumph TR3/TR3A has some horribly designed turn signal lamps. It's
near impossible to replace the lens in these things. I've finally found
a somewhat reasonable solution:
- Use a lightly greased flathead screwdriver to help pull the
rubber lip over the rim.
- Use shims under the rubber body to push it forward towards the lens.
The second part is crucial to a relatively easy install. Try it both
ways if you don't believe me. :)
For a simple makeshift shim, I had some carb gaskets lying around from
a recent gasket replacement, so I tore two of them in half and slid
them underneath each side of the flasher lamp rubber body. Otherwise
there's no way to pull the rubber forward over the lens rim.
While applying steady (and quite a bit of) pressure on the lens rim,
run a screwdriver around between the rim and the rubber body to get it
to wrap over. When you're done, run your finger around the outside of
the body pulling forward to make sure it's completely wrapped over
the lip of the rim, then be sure to clean off excess grease.
Finally, make sure you can rotate the lens/rim around to ensure
that there are no weak spots where the rubber doesn't quite hug the rim..
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