Love... love... love this stuff - but be careful! A little bit goes a very long way.
Clean-up the headlight mount and orientation post... until it fits 'just right' on the Sandblaster body.
Also, do a test-fit of the headlight lens - adjust as needed.
Apply just a tidbit of glue on each of the four corners.
And press the headlight lens into place.
Sand the headlight mount with a small piece of sandpaper - leaving the dust behind (it will help fill gaps).
A good drop on both sides of the mount...
And hold the headlight in-place for twenty or so seconds - repeat for the headlight on the other side!
FYI, the void in the headlight is just big enough for a Breadboard Friendly Neopixel... the wires can be passed through the mounting hole into the body.
But that's just a coincidence... right?