nev..
Terrarist
Thanks for posting this. Made me comfortable enough to attempt fixing mine. I did the same thing you did, but the glue didn't last long. I took it apart again and came up with the fix shown in the attached photo. It's been wired together for about a month now and seems quite robust. I also glued in a piece of old sunglasses lenses ground to the right size with a dremel over the high beam LED. Makes a great improvement to that too bright LED.
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That is a really nice fix. As per my post above, I just glued mine back on, and it held for a few rides, but then eventually gave way again. Second repair was to glue it as before, and then run a few strips of gaffers tape over the T joint so that if the glue gives way again, the piece will be held in place by the tape.