was going to mention, many farmers also have the tools for getting fittings clear, many will LOAN you a tool with a deposit, as will some auto parts stores, tractor heavy equipment shops too!
as unless you have a lot of things with fittings , them tools don;t get used enough to buy IMO
all the more so if you do regular Pm's and grease things like you should
as just greasing often and pushing out old grease tends to keep fittings working forever
its when they sit and don;t get greased often, or properly(or wrong type of grease that things get frozen up on them
this is a good example of why to use correct grease and grease often IMP!