Deleted member 4366
Thanks for the link. I just ordered a couple for my other bikes.I tried these cheap copies like the Zefal Spin which is the smaller version of the Cyclops and I find it to be good. You can't make out exactly what is behind you but you get a good enough idea. It is held firm by opening the hinge connector part and stuffing a small bit of bluetack in there.
I don't like being without one of these now.