Dynamo removal

[David2021]

Any tips for taking the Dynamo off?
My blue car has no shroud on the radiator ( which doesn't seem to affect the cooling (new radiator!) and is not too difficult.
The green car has a shroud (and a Special Equipment dynamo - still a C45PV3).
The adjuster bolt and the rear "hinge " bolt are easy to remove , but the front hinge bolt....it is almost impossible to get at the head of the bolt because of the shroud and has the fear/potential of losing the spacer/bush...and as for changing/removing the fan belt there is no space to lever it off (even when the dynamo is loosened off & pushed inwards the block).
The manuals are very coy about how to do this...and to check the brushes with the dynamo in situ is I think "tricky verging on impossible" at the most charitable.
Any words of wisdom?
This may be necessary if it is the dynamo that is faulty, but initial tests suggest the regulator may the problem...