I found the archived thread:
Here is the picture:
I got the flywheel close to the 28 degrees BTDC, and marked the flywheel and case together. I got Adam to run the engine, while I stood on the right side and shot the timing light at it, while clipped to my primary ignition. That would be the SDS ignition for you. I’d check the alignment, shut down, and move the sharpie mark on the case until my fixed ignition for the primary gave me alignment of the marks. Then I set the timing of the secondary by clipping onto a secondary plug wire, looking at alignment, and then making a timing adjustment on the secondary. Took a bunch of tries.