Penetrating oil and heat look like the most promising method here?
These are flat screw heads that are partially buggered up from intial attempts and removing them.
Jan I have a thrust bearing wrench for a continental 220 (W670) I bet it's close. I believe I have the spline wrench for the prop shaft also I am sure that is the same. You are welcome to use it anytime.I would like to see a picture of that thrust bearing wrench (you could just email it). I'll need to make one in a few months to work on my Rangers too.