Ha! IIRC they slip into the sportsfinder when you flip down the center of the WL finder. Seems like a great idea for fast moving subjects and zone focusing-- but I never used mine when I had a C330. Really great cameras and optics, but bulky.
Oh Ok there for something like a wireframe viewfinder, not going top of the focus screen. Now I get it. Hope your right about the camera BT, Im just waiting on a spare part to get it going again. I like the close focus ability of them. Thanks
If you are curious, I have some templates you can cut out to see how they work. I don't have them on-line at the moment.
Some people can follow action with a waist level finder, many cannot. If you do not have a prism, the sports finder (with zone or pre-focus) makes a good alternative. Very similar to the wire frames on 'press' and technical cameras.