When I first purchased the light for my wife, I found the plastic in the back to be shattered in the area where the big screw screws in. This was how it came. I exchanged it for another and made a big deal out of checking out the replacement in the store to ensure that that one didn't have the same defect. It didn't, however after taking it home installing it, using it a little, and then moving it around, I noticed the plastic around some of the other screws in the back began to shatter the same way. Therefore, the plastic Blackburn allowed to be used is of inapropriate quality for the application. The plastic would probably work fine for a desktop figurine that is neither touched nor moved, but for a bike light that needs to be durable, I am heavily dissapointed.