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I suspect a lot of it is about 'what the trade will bear'
There is nothing very difficult about the engines. 'Finding' parts is a bit of a challenge - which many people rise to by writing new paperwork for ex-military spares.
Granted there is a level of expertise - simply knowing which parts are suitable for which marks etc but all this is documented - although an encyclopedic knowledge certainly helps.
I learnt a huge amount about these engines and their care, from my engineer who has now passed on - 'in the land of the blind the one eyed man is king'
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