There are a few chrome series 180mm lenses that have problems on the auto-cocking bodies (C33, C330/f/s). The Seikosha-MX shutters have the cocking lever in the wrong place, and this a different angular travel from the later designs. These lenses were designed with the Mamiyaflex C and C2 in mind.

Most Seikosha-S shutter 180mm lenses will operate fine. There are a few where the shutter housing fouls the cocking and release mechanisms, but that doesn't seem to be your problem.

So you may have one of the very few lenses in the Mamiya TLR system where there is an incompatibility.

See http://www.btinternet.com/~g.a.patte...q/m_faq-2.html