once it is proved the mechanism is working, then the Timing would have to be set, a little more complex than a Mechanic showing you in 5mins, I THINK
All I wanted to say is that the Mechanic would show which bolt to loosen and which way the distributor has to be turned a small fraction to advance or retard the ignition - and give the appropriate health and safety warnings (as good Mechanics do).
This method is good enough to find the point just before the beginning of pinking on an engine which runs o.k. otherwise. To be very thourough we maybe had to start with adjusting the valve timing
BTW not every distributor has a vacuum mechanism. And on many highly tuned engines (Loti) it is disconnected.
