I read all that too, about stopping the "pawl" with a nail. I took my mag apart to see how that was supposed to work, and there was no pawl in there. Must be more than one variety of mag, I suppose. I just set mine with the impulse connected. Might not be right (and I welcome alternate opinions), but it seemed to work fine. The way I timed mine was to first crank the engine slowly until piston #1 (near radiator) is at tdc. I judged this by removing spark plug #1 and holding a finger over the hole. While cranking, feel when the compression starts (yes, you can crank with one hand while the other covers the hole, but it is easier with two people). Then, insert something into the hole so that you can feel when the piston reaches all the way to the top. Do not insert anything that might get lost in there. I used my little finger, after making sure I could get it out again. When set at exactly tdc, mount the magneto after setting the "distributor" part of the mag so that sparkplug #1 wire is getting spark. The connector to the drive from the engine forces this adjustment in increments that are large. Only one will even be close. Fine adjustment, if needed (in addition to the spark advance control rod), can be made by altering the placement of the bolts in the round metal spacer that connects between the magneto and the drive from the engine. The holes for the bolts are not symmetric and allow for adjustment. On mine, I didn't need to do this. Good luck.
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