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At the risk of stating the obvious, go out at night, find a suitably level stretch of road, take a spanner to loosen the bolts, sit on the bike, move the headlamp unit until it is at a suitable elevation. In practical terms, if the headlamp beam is too high, you will be aware of it when you are riding 'cos you will be illuminating the road signs instead of the road.
The lamp bowl aims straight ahead, the angle of the dip beam will be set by the reflector in the lamp unit, thus a US or european market bike would have a different reflector unit to a UK or NZ bike.
(I have a Cibie H4 headlamp in my T140, it is an excellent unit, better than the headlight on my 'modern' Trident).
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