Re: Rusted in grub screw.
Yep, i have seen the 1:1 ATF/Acetone mix used by Dom on BBC's The Repair Shop, i have a feeling Edd China or Ant Anstead may have mentioned it also.
On experimentation with blends of Kerosene/Diesel/Petrol etc, i found wd40 superior to all of them. Farming supplies even sell it here in unpressurized 5 litre cans! Immersion always wins out of course, if the part is small enough to immerse..
Dave
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