FYI, magnesium is even softer than aluminum.
Greg(Wolfgang), that is a GREAT tip. This could really save someone(New Greg!).
Here is a link to the studs:
https://www.amazon.com/Step-St...-Buggy/dp/B076HWWZ1D
The one stud that never strips is the one that holds oil pickup.That stud is VERY difficult to get out, but it can be done. I did it with a lot of swearing and I had to dent the pickup a little with a good-sized hammer and drift. Then I could get a wrench into the assembled motor and remove it. So much easier if the case is split............