Re: Rusted in grub screw.
I once heard of a penetrating solution based on paraffin with graphite grease dissolved in it.
If the screw is really stuck then perhaps it's time to look at a more extreme engineer solution- helicoil. Drill the screw out, re tap and fit.
As for #12, I tend to use blue locktite.(you never know when you need to get that screw undone)
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