I just Googled "Mod 54" and watched a short video of the loading operation. I don't think I would want to process sheets with one, since the rotating drum method I favor uses so much less solution, but it occurs to me that the Mod 54 in a Paterson tank should work well for washing. In the video, the Paterson tank used is apparently a different version than the 1970's model I have had sitting on the shelf, unused, for several decades. The one shown has a flat top; mine has a flexible cap which sits atop the hard plastic screw-on top.
Does anyone know if the Mod 54 is compatible with my older Paterson tank?