Wedge-shaped from the side, but mitre-shaped from the front. The almost straight sides achieve contact over most of the wall surface, with a contact area radius of only 0. 14 mil (3.5 Gun) giving a theoretical 70 KHz tracing ability at the disc centre.
"After searching & talking to many family members my Sister and I finally found Uncle Herb's old wire recorder and tapes. We thought we would play them ourselves on the recorder, but after reading info on the internet about wire recorders and snarls, etc, we started looking for a company to convert them for us. We finally decided on CVC. We ..."