Quote Originally Posted by Gerry M View Post
The disc with a hole in it is the piece I just bought. I wondered if the 5' finder was necessary to make the disc work properly.
Gerry,

You don't need the 5 degree viewfinder. In fact, you can use only one attachment at a time.

Can you post a photo of the disc you bought. Based on your statement ("I wondered if the 5' finder was necessary to make the disc work properly."), I have a feeling that the disc is not the correct one.