Quote: Unless you use one of the older Paterson tanks which have a smaller diameter
... in which case a 35mm spiral won't fit?
BTW my Paterson "System 4 Universal" tank (circa 1974) (takes two spirals set for 35mm, otherwise only one) has imprinted on the bottom:
35mm or 126, 10 oz. (290 ml) per film 127, 13 oz (370 ml) per film 120, 17.5 oz (500 ml) per film
Despite this, I did on one occasion ruin a 120 film by only using 290 ml of developer - a quantity I was used to pouring out when developing 35mm, which I did a lot more of. Which is why I wrote the warning.