sanking: the film is loaded directly into the tank via a slotted rectangular bar which one moves across the top of the tank using little nubs as locators over each slot. it's ingenious enough and works fairly well, but requires practice to avoid mistakes. i have since read that it makes sense to pour developer into the tank in the dark with the lid off to fill it more rapidly and avoid uneven development.

i use the tank now as a film washer filling it first with water and then sliding the tray fixed film into the slots quite easily in daylight.