I've used this stuff for years and it has penetrated every rusted and frozen fastener on which I used this product -
Very definitely, Tom. Forgot to mention that.If you use that penetrant, clean it thoroughly after, If it gets on your work piece, it may ruin any finish you apply.
Didn't for me, either. That's why I use the Dupont Teflon product I mentioned.I hit it with WD40 yesterday but that didn't make any difference today.
If you can get your hands on some, Kroil is my favorite. It's made for steel on steel seized bolts. I'm not sure how it would free steel on aluminum. Keep your part wet with it for couple days, then use some vice grips on end to work the screw back and forth, if you can get to it.Thanks David, I didn't realise you were referring to the same part. That product doesn't seem to be available locally but I've had a fair amount of success with petrol or distillate (automotive fuels) to free up rusted nuts previously. I'll have to understand more about penetrants.
A slotted screw head doesn't provide much purchase.