The first two came out like butter 😀 , the third one was probably corroded all the way through already. I did end up heating it , and turned it out using a pair of nuts locked against each other, rather than try to use vise grips and thrashing the stub 😳 . I should have done a preheat like you say Oltimer, but was tricked by how easy the first two screws came out 🙄 .
So now I’ve hijscked my own thread, here’s a shot of the gearcase near the vent hole. I wonder if it’s cracked there or just casting flash spiderwebbing around the lettering.
Here’s a bulge on the lower half of the gearcase. Kinda hard to see.
Dang, I had hopes for this gearcase 🙁 Maybe a tig welder can salvage it. 😉