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The angle mount distributor uses a small metal clip on the end of the shaft. The rotor presses down over this clip. It is a fairly snug fit to get the rotor on all the way. As you are pushing the rotor down, sometimes it feels that it is in place, but it isn't. Once the rotor is firmly pushed all the way down, it is LOCKED to the shaft. The shaft itself may have some backlash/endplay, but the rotor should not move on the shaft. If there is any lost motion between the rotor and the shaft, the clip is missing or the rotor is not pushed down all the way. The tractor should start and run with any reasonable amount of endplay/backlash in the gearing. Excessive wear leads to spark scatter and sub-optimal engine efficiency, but wouldn't cause a gross "no start" condition. The shaft should not have any noticeable play perpendicular to the shaft. This will cause the point gap to vary as the shaft turns, and will make it hard to set the dwell correctly.
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