Let me add something I have considered:
The EL500 is designed in such a way that you could change batteries without taking it off the bike mount (can't do that with the 300 version).
So, I was thinking that if I had to, maybe I could try the 500 again, but super glue it or something to the mount in hopes that such would reduce stress on any one point so the mount on the light part would not chip off little by little. Any ideas on that would also be appreciated.
Bob