I think I can predict the answer here but will ask anyway.

I have purchased a new bone nut for one of my builds. It is pre slotted but the slots are shallow and will need deepening.

So what nut slotting files are best?

Decent ones are expensive - especially for casual users. I have used Hosco double sided ones before, which were very easy and nice to use.

There are similar knockoffs on eBay, which I’m sure are inferior. Also there are a lot of cheap welding tip cleaners sold as nut files.

So what does everyone use, and what should I get?