Follow Up
Follow up ....
I repeated the same test of where the mag snaps on a different plane with a similar new, rebuilt Slick mag and it snapped very close to TDC where I expected. So, I don't think that there is anything normal about my result where it snapped well after TDC on my plane.
I also talked to the builder of the plane and was able to piece togther the history of the magneto. It was installed new on June 23, 1995 and that was 1091 hours ago. It has never been opened and serviced to his knowledge in all that time (no internal timing adjustment, no 500 hour inspection, etc). I think we got our money's worth out of this mag, so a new one is being ordered.
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