Thats the best kind to use and they have single bade ones kind of like a knife blade, as we know a hacksaw isn't tapered like a file. Well my hacking inclination is pretty strong having been a mech/tech all my life, drag racing mc's for 25 years and plenty else, many here don't agree with some of my methods but if you proceed with an abundance of caution and patience, you can succeed with some pretty unorthodox workarounds.
In general, any "loctite" other than red is an oxymoron, its not loctite if it doesn't hold semi permanent.
In this situation it seems likely to come loose more easily when already prone to do so.
Never had anything put up much of a fight, even with red, I would get this completely clean and dry and lock it down good. these are where I use my removal method setup to tighten these when I think they won't stay tight and it always gets them apart afterwards too.
This has never failed to remove a cup without any damage to the tools, parts, frames, paint or flesh.
The oldschool Sugino wrench is the key but others work with this when you trap them in place so you can really lean on them, adding a pipe when necessary.
