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The problem with putting a fan or airflow on the stock trombone is that it really won't do anything.
The trombone is not an oil cooler, and it, by itself, is not an effective radiator. Its really just a turnaround for the oil. The oil is also not in there very long. Therefore, it has been shown that getting additional air flow to it is not useful in any meaningful way.
I think Jack's solution is the best: A late 80's Carrera cooler with the fan, as a replacement for the stock trombone. Its a tidy factory installation that should solve your problem.
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