That pinch bolt is supposed to be replaced every time it's removed anyway, I don't think you can get it out without damaging it.

+1 on the ATF/Acetone mix, I also like Kroil if you want something in an aerosol form. It's a bit expensive but at least for me a little goes a long way. Also smells nice unlike PB Blaster. I see PB Blaster as mostly useless, it's not a very good penetrating oil and WD-40 is better for cleaning and protecting than it is, also a bit cheaper.

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.