Very happy to share the diagram. It would be nice if my name stays with it.
I don't know if the Facel Vega has the same motor. There is another Piper motor for which I found a diagram on line that has two field coils and three microswitches with a "last inch" switch.
If you do end up servicing the Bristol unit there are a few points that may help.
The lower chain gear needs to be removed to get the motor off the back plate. There is no room to get a spanner or socket on the bolt that retains the tapered pin. I just managed to get a BA box spanner on, undo the nut until level with the end of the thread and then use a parallel punch to break it free.
Stripping the motor is easier once you understand that the key is to remove the field coil. Remove bakelite side plate and unsolder the two coil wires then the coil can be levered out. It has a locating pin on one side so can't be tilted.Once the coil is removed the top screw that retains the gear housing can be removed. Once the housing is off the split pin retaining the worm gear must be removed before the armature can be withdrawn.
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