By the way, don't let the linkage shaft separate from the body. Mine did and it cost me $65 (or was it $80?) to get it re-attached. My camera repair guy is a generalist with almost zero experience on these cameras and spent an hour figuring out how the baggie of parts I gave him fitted together.
And Pioneer is right. I have several 35mm bodies, a Mamiya tlr and a 4x5 studio rail camera, but the Ikonta 521/16 6x6 with zone focusing is the most fun camera I own. I really lust after a Zeiss 6x9.