Now I can see how an aligning an engine using shims and a crowbar to move it around will correct any problems with pitch
and yaw but I am having trouble seeing how I can align the output flange on the gearbox
with the matching flange on the propellor shaft.
That is, I want to raise, lower or move tranversly the engine/gearbox so that the centre of the output flange is aligned with the centre of the prop. shaft flange.
The problem is, of course, that the centres are not visible so that it is not possible to see when they are aligned (or not).