This is the package enclosure that came with the Sunblocker. Installing was as easy as it sounds - -

But what was I thinking!? Oh, alright, I wasn't thinking, and here's proof: http://www.webbikeworld.com/Reviewed-motorcycle-products/shade/

In case that link has expired, here's the story: go to an auto-gadget outlet and buy their smallest pack of window-tint plastic. Cut a piece to fit the top edge of your visor, full width, and deep enough so that you must tilt your head down a bit to look through it. Wet the film and the visor (a drop of dishwashing liquid in a pint of water.)

Gently slide the film in place.

Using a folded paper towel as a squeegee, gently stroke excess fluid and air bubbles out to the edges. The "film instructions" may make this process more clear.

QUESTION:
Why doesn't everybody
know about this,
and why didn't
anyone tell me?

Here's the reverse of the above.

If you buy window film, I suggest that you get the highest density, then make a template from plain paper to experiment with the placement and size.

When you are convinced you have the dimensions and curvature right, use the template to guide cutting the window film.

Squeegeeing the bubbles from under film is easier with a damp paper towel folded into a small square. Once one end of the film is adhering okay, the rest is easier to work.

And if you make an error -- you have enough film to do about 250 helmets; peel it off and do another!

There's the "Sunblocker" in my old helmet.

By flipping the face shield up one or two clicks I get more fresh air and still make some use of the sun shade.

Seen from the inside, it really is effective.

My less-than-perfect application left numerous tiny bubbles under the film, which you can't see. In fact, neither can I when wearing the helmet.