I have the Hawke sidewinder 8-32 X 56 and bought the anti reflection device to replace the 4 " sunshade. The ARD works great except that there is no accomodation for using the factory lens cover. So it was off to the shop and 1/4" of the sun shade was parted off in the lathe and the the threaded section was epoxied onto the front of the ARD.Now the lens cover screws on as it did before. Would have been nice if Hawke would have had this threaded section made onto the ARD to begin with.