I just purchased a mint minus 5 X 7 Compact Graflex which I haven't received yet (I hope it is truly mint minus). I went after this one because everything works and I have read that the shutter is more trouble prone because of the secondary curtain. Does anyone know how this works? Are there certain maintenance requirements to keep it working? Why didn't Graflex design the mirror to be self capping like the other reflex cameras? Thanks in advance.