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Olivier 3.0,
.5 cm (5 mm/0.020"). I couldn't find the specs. If Mr. Walker happens to tune in, I'm sure he would know.
If the shaft is lifting and causing the dwell (and point gap) to change, you could remove the pinion gear and insert a spacer on the shaft to take up the unwanted play. The net affect of this dwell change is that the ignition timing is advancing a like amount.
If the dwell is fluttering 2-3 degrees, this is an indication the distributor cam lobes are worn unevenly, thus the opening ramp on each of the 6 lobes (one for each cylinder) is not symmetrical.
If your vertical play is within spec, I would suggest changing to an optical breaker system to replace the contact points. These kits don't require a good cam lobe for proper operation, and adjusting points is a maintenance item of the past. Look at Crane's XR700 or Pertronix points replacement units as they're the most cost effective alternative to buying a new/used distributor (typically <$100).
Sherwood Lee
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