Protecting bike attachments such as lights against theft I was wondering what one could do to keep his bike attachments from being stolen. On Monday two lights were stolen off of my bike. I only had them for a day. It was the kind that has a rubber "strap" of sorts that goes on the handlebar. I only really care/want to know because they were fairly expensive...
Take the lights and anything else thats likely to be stolen off your bike. 

For things that can't be removed easily, you may want to use something like Pitlock security skewers (or security bolts) or glue in ball bearings or similar into the head of the bolts (which will make them hard to remove when you need to remove them, but a casual thief can't remove them easily). Also, make sure you know how to properly lock up your bike (which has been discussed at length in other places on this SE).