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This is my first real post on Cinematography. I'm hoping there must be someone out there who knows where I can find some information on the ARRI 'Single-Frame-Gear' (I'll just put S-F-G from now on). I've recently purchased a virtually brand-new ARRI single-frame animation unit with the capping IRIS device and cables, and the extra gear sets for different lengths of exposure. I'm hoping someone either has some form of the original literature or experience of using one of these. It works, after a fashion, with a motor inserted into the rear of the S-F-G but only with the main/camera motor running which seems strange. I was expecting the hand release would send power to the motor and in turn drive the single frame part of the set-up on demand. It does actuate and the 'capping-iris' opens and the motor slowly turns three times and exposes a single frame before capping the lens again. I just don't know for certain which motor should be used, and how the power should be turned on and off to the motor. I have read somewhere that it requires a 25fps governed motor, I have a fixed speed 25fps motor and another self-regulated 25fps motor with the extra bit on the side that has a 9 pin input via an Amphenol connection. This motor needs attention as it doesn't run presently. I'm also unsure why this second motor has a cable with a 7 pin Cannon on the female end. Would I be able to use the similar 16BL cable with 4 pin Cannon on it to connect to a battery? Would the pin-out be the same? If anyone has any helpful ideas or suggestions I'd be greateful. Paul