Since I don't have the original oil slinger, I had to come up with a reasonable replacement. I tried spin-forming some aluminum flashing, but that didn't work right. I just don't have the right tools.
I might as well start with something that already exists with the approximate shape. So, I fished through the recycle bin and pulled out a tin can from cat food. It was the right size and shape, but I just needed to cut a nice hole in the center. the air nibbler worked well for this task. I had to re-enforce the shape of the bottom of the can with a bit of welding wire, which I crimped the can around the outer edge. It's ugly, but it seems to work and doesn't hit the sides or the seal housing. I certainly don't want it to get caught in the halftime gear and get shredded.
Incidentally, the timing cover is a little bent. I tried to straighten it as much as I dared. I'm not good with sheetmetal, but I didn't want to make it any worse than it already was. The last thing I want is to warp it and cause it to leak.
I'm considering trying to create a second attempt, using some stainless sheetmetal. It will be more rigid, but harder to work with. Its hard to get a cone-shape out of the metal without it kinking on me. It can't be completely flat or it will risk getting caught in the halftime gear.