All... Finally found time to replace one of the pot mounts in my ZW-C on the A-B posts. It was fairly, very, easy to do. Only problem I came across was the original screws used to reinstall the pots assembly onto the new aluminum mount, they did not want to easily screw into the associated mounting holes in the aluminum pc. Had it been communicated with the new aluminum mount, or I had checked better and have different screws at hand, it would be a breeze on this procedure. I looked at my parts supply, but did not have any the right size and thread. Today I went to Lowe's and acquired the proper machine screws, M3-.50x20. I will use these and the second alum pot mount on the C-D posts of my ZW-C at a later date. Although what I bought are 20mm length, I believe 12mm may also work, but may be too short and not have as many threads to secure sufficiently. Also, the "free play" present in my ZW-C A-B handles was not eliminated with the installation of the new aluminum mount. This I had to correct with shimming of the gears shaft, beneath the original aluminum bracket. When re-installing the pots on the new mount, be certain to rotate your pots in proper direction to ensure zero output and full 18 volt output as corresponding with handle positioning. Also, it will be needed to glue proper shimming on the new aluminum mount for elimination of vertical play in the pots themselves as they are rotated by the gearing.
Refer to attached pictures, listed in sequence.
Jesse TCA