I own both a Cambo 45SF and a Cambo 45NX. I also own and use a Zig Align for parallelism of the standards.
I recently made the following experiment: I align either of these cameras properly with the Zig Align, meaning one can see through the hole in the front standard mirror an infinity of circles perfectly aligned on the mirror sitting in the rear standard. The controls are tightened properly so that they keep this corrected position.
I now attach a metal wire around the lens to be used and fix the wire at two places on the front standard still set with the Zig Align. Since I use a Linhof to Cambo adapter as the front standard, these 2 places are the 2 metal "pieces" on which the lens rests. I let the lens hang freely from the wire and look again in the hole of the Zig Align. The weight of the lens invariably tilts the front standard forward, enough to throw off the alignment in that direction alone. Removing the lens reverses the process and the camera is realigned. This happens on both Cambos.
As said, the controls are pretty well tightened and tightening them more could endanger them. The NX is more sturdty than the SF and exhibits the exact same fluctuations of forward tilt. The NX has axial tilts and the SF base tilts.
As anyone gone through the same procedure on their cameras and Zig Align. We are talking here of a substantial tilt (substantial in the sense that if it were there to start with, you would definitely correct for it, at least for the ones who have come to trust their Zig Align).
Second, if you do have checked your alignment with the lens weighting on the standard, and have found the camera to remained aligned, could you mention the brand and model. I am considering the purchase of a Technika 2000 and of course would love to know if such a test had been run on that camera.
I live in the Los Angeles area and am available for carrying such a test if your camera mounts the Technika lensboard. The mirror that sits in the front standard for my Zig Align is installed in a Technika lensboard and is not removeable from there.
Thanks for your collaboration.