I was graciously gifted a Stanley No 39 1/2" dado plane a few months ago. Thank you again Ron M! It was heavily corroded with rust. I couldn't get any movable part to budge. It's been soaking in ATF for close to 2 months. Last week I successfully removed three of the four screws that hold the scoring cutters. That last screw bent my vintage Craftsman screwdriver and remains attached to the plane for now. There are three knurled bolts/screws that remain to be removed. The rear one applies pressure to hold the cutter in place. There is also another bolt/screw with a slot that's associated in some manner with the iron/cutter. The forward knurled bolt looks like it controls the depth stop. What is the best way to get a grip on these three knurled bolts to remove them? I think before I attempt this I will take the plane out of the ATF and put it in an electrolysis tank to remove the rust. Thoughts/guidance is much appreciated. A quick search did not turn up a parts diagram for a No 39 which would have been useful for identifying parts. If anyone has a link to such a parts diagram that would be great.
Update: I tried to remove the one knurled bolt with a slot using a large screwdriver. It didn't budge. I don't believe that after two months there's much to gain by keeping the plane soaking in ATF. Will clean it up this week and put it in an e-tank as mentioned above.
Thanks!
Mike