There is some confusion among learners on how to use: again and anymore but specifically more so with: anymore. Perhaps the first being its orthography, anymore can also be written formally as: any more. Only recently has the one word version gained acceptance. Secondly, in some parts of the US it is found in positive sentences such as :"Anymore we watch videos rather than go to the movies." However, (I believe) it is very uncommon in the UK and the majority of grammar books would advise against using this construction.
Anymore means the same as any longer and nowadays. These first two expressions are interchangeable, and the meaning will remain the same.
- "She's always out with her boyfriend, she hardly meets her old friends any longer/nowadays."
"She's always out with her boyfriend, she hardly meets her old friends anymore."
"Just a little more work, I won't need that tool any longer"
- "Just a little more work, I won't need that tool anymore."
However, due to the repetition of the word "more", the last sentence sounds clumsy and awkward. Choosing any longer will avoid this minor inaesthetic construction.
Note: I removed the negative meaning adverb, never, in order to make the sentences flow more naturally.
again = once more, another time.
- "Just a little more work"
is grammatically correct and acceptable in writing but sounds slightly stiff in the context of everyday speech. If your aim is to sound more natural try: "a little bit" (a very common colloquial expression).
- "never need that tool again"
is a very strong statement allowing no leeway; however, speakers sometimes interject
again to add a touch of humour and/or extra emphasis.
Just a little bit more work, then I'll never need that tool ever
If I were the speaker and I had been using a tool for a certain length of time I might consider superfluous the word, work, and instead say something similar to:
Just a little bit more, then I'll never use that tool again.
I just need to use that tool for a little bit more, then I won't be
needing it again.
or (with work)
Just a little bit more work and then I won't need it any longer