so I'm undecided whether to get a refurb 520 for A$142 or lash out and finally ditch Garmin and go for the Bolt at A$399 (can't seem to get it any cheaper as O/S companies won't ship to Oz).
Personally I'd put a piece of blue painters tape on it to charge it. You could also try a different cable to tweeking the cable a little with pliers so it fits tighter.
That said, my 510 got destroyed in a crash and Garmin replaced it with a refurb for a flat fee of $80 so I would check into their replacement policy for the 520.