Well sumbich... that was easy.
So, while waiting on the epoxy cure on the test rotor, I decided to play around with some other ones and come up with a plan. This is gonna be a pic intensive post, so bear with me... Thought about using a degree wheel, or even a digital level to figure out the angle of the magnet placement.
Both ways are pretty easy to figure out the angle... but I'm trying to stay faithful to the "backyard wrench" idea behind this whole endeavor, and not everyone has these toys. I was playing with a ruler when I noticed something.... look at the relationship between the timing mark and the magnet.
Looks to me like they line up at the edge of the mount. Looking at the edge, there's a shoulder there just below where the threads end.... enough to rest a straightedge on.
So I rested the ruler against it and lined one end up on the timing mark.
And here's where the other end wound up....
Drew a line with an ultra fine sharpie....
.... and drew a line from the edge back to the center.
Sonofagun... it splits the magnet right down the middle. So I duplicated that process on an old style rotor without the magnet.
Added some tape the the sides and ran the marks down the sides of the rotors.
Also did the same on the timing mark side of the rotors. Then I stacked 'em on each other and lined up the timing marks. Used a mirror so I could get a pic of both sides at once....
There's just a slight amount of camera parallax error there, but trust me, both sides lined up perfectly.
So... what's the correct angle? I have no idea.
I'm sure my ocd will force me to find the angle at some point, but honestly... we don't need to know. It doesn't get much easier than this for the backyard wrenches out there... and that's what counts.