The best penetrant is a 50/50 mixture of acetone and automatic transmission fluid.
Fill it up and let it sit for a week.
And here I thought I was the only one who knew about the above pentron replacement. Good job Otto!!
Craig
My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear My truck ....... Respect The Rust If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.