Here's a link to the Touratech security filler cap device:
http://www.touratech.com/shops/008/prod ... ts_id=5283
Expensive, but at least no-one can drop thing into your engine.
I suppose it would be possible to lockwire the filter in place.....
Urgent....... Security Camera .
Re: Urgent....... Security Camera .
It's not falling off, it's an upgrade opportunity.