When I started developing film it was 120 or 620 size. Kodak's directions said to put a film clip at each end of the roll and see-saw it in a tray of developer. This was easy to do as the film of the time was orthochromatic and a safelight could be used. Same method for stop and fixer. This was a common practice at the time since developing tanks were not usually available. The method was the antithesis of stand development as the film was constantly in motion. Old photo books often illustrate the technique.