My Zone VI/Wista camera originally came with a Zone VI tripod and Bogen 3047 head. It works well most of the time, but the "little" Tiltall gets more use away from the truck. I occasionally notice an annoying tendency for the camera to slip loose on the tripod head and rotate. My Wista has two tripod screw bushings for different balancing. The two holes are about 1 3/8" apart. I plan to thread a short bolt in the back hole from inside the camera, leaving the front threads protruding about a quarter inch. The radius of the table on the Tiltall is just over 1&5/8". I'll file a notch in the edge of the table for the protruding screw. The two point contact will prevent any slipping. The bolt could be switched to the middle hole, allowing the back bushing to be used to hold the camera. The bolt would then fit against the front of the revolved table. A socket head bolt (using an Allen hex wrench )could be used instead from beneath. The bolt could even be nylon. A shim with an edge could be made to keep 35mm cameras from slipping when used in vertical mode. I thought about posting this after the fact, but by posting it beforehand, I can benefit from your thoughts. I will certainly post the results. Thanks in advance.